A converter cabinet structure

Abstract

The application relates to the technical field of power grids, in particular to a converter cabinet structure which comprises a cabinet body, a plurality of accommodation spaces are separated in the cabinet body; a first accommodation space is separated into an upper heat dissipation area and a lower heat dissipation area which are stacked in an up-down mode by a horizontal partition plate; a plurality of flow guide plates which are parallel to each other and are arranged in the transverse direction of the cabinet body, the flow guide plates and the horizontal partition plate and the top plate, the front wall and the side wall of the first accommodation space jointly define a plurality of strip-shaped air ducts, through the strip-shaped air ducts which change in the transverse direction and the cooperation of the shunt flow guide structure and the flow leakage gap design, the accurate matching of the heat dissipation resources and the heat source density is realized, the turbulence and the heat dissipation dead zone in the wide cavity can be effectively eliminated while ensuring that the mass flow deviation of each air duct is less than 8%, and the core area temperature difference is reduced; on the basis of improving the functional integration degree of the unit space, the upper and lower layers are combined with the independent heat dissipation paths, the high-opening-rate pulling module tray with the jet cooling effect and the parallel architecture of the multiple accommodation spaces.

Description

Technical Field

[0001] This invention relates to the field of power grid technology, and in particular to a converter cabinet structure. Background Technology

[0002] As the core power conversion device in a wind power generation system, the converter's structural design directly determines the unit's power generation efficiency, operational reliability, and ease of maintenance. It is a crucial component for adapting to wind turbines of different power levels and coping with complex operating conditions. With the wind power industry upgrading towards higher power, domestic production, and intelligent systems, the converter cabinet structure must meet electrical performance requirements while also considering environmental adaptability, installation and maintenance efficiency, and cost control, resulting in a multi-dimensional, collaboratively optimized design logic.

[0003] Traditional converters often require a larger cabinet size, resulting in lower functional integration per unit space. If the spacing between components is compressed to improve integration, safety risks such as insulation breakdown and short circuits are likely to occur, and the problem of heat accumulation is aggravated. It is impossible to meet the dual requirements of compact layout and safety and reliability. Based on existing converters, this invention provides a converter cabinet structure that changes its internal layout, thereby solving the heat dissipation problem per unit space. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems with the layout of converter cabinet structure in the above or existing technologies, the present invention is proposed.

[0006] Therefore, the purpose of this invention is to provide a converter cabinet structure.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a converter cabinet structure, comprising a cabinet, the interior of which is divided into several accommodating spaces; a first accommodating space, which is divided by a horizontal partition into an upper heat dissipation area and a lower heat dissipation area stacked vertically; a plurality of parallel guide plates arranged laterally along the cabinet, wherein the guide plates, the horizontal partition, and the top plate, front wall, and side wall of the first accommodating space together define a plurality of strip-shaped air ducts, the inlet of each strip-shaped air duct is simultaneously connected to a first air inlet and a second air inlet, and the outlet is provided with a first air outlet and a second air outlet; the cross-sectional area of ​​the plurality of strip-shaped air ducts varies in a gradient along the lateral direction, with the middle air duct having the largest cross-sectional area, and the cross-sectional areas of the two side air ducts decreasing step by step, and the ratio of the cross-sectional area S4 of the middle air duct to the cross-sectional area S1 of the outermost air duct is 9:7.

[0008] As a preferred embodiment of the converter cabinet structure of the present invention, it further includes a flow diversion and guiding structure, which is set downstream of the first air inlet and the second air inlet, for uniformly distributing the airflow from the two air inlets to the multiple strip-shaped air ducts, so that the mass flow rate deviation of each air duct inlet is less than ±8%.

[0009] As a preferred embodiment of the converter cabinet structure of the present invention, the number of the guide plates is six, the number of the strip air ducts is seven, and adjacent strip air ducts are separated by guide plates.

[0010] As a preferred embodiment of the converter cabinet structure of the present invention, the guide plate has a venting notch at its tail end, and the area of ​​the venting notch is less than 3% of the area of ​​the guide plate.

[0011] As a preferred embodiment of the converter cabinet structure of the present invention, a first exhaust fan and a second exhaust fan are fixedly connected to the first air outlet and the second air outlet, respectively.

[0012] As a preferred embodiment of the converter cabinet structure of the present invention, the first exhaust fan and the second exhaust fan are both PWM speed-regulating fans, and a temperature sensor is provided in the middle air duct. The output signal of the temperature sensor is used to adjust the speed of the two exhaust fans in a closed loop so that the temperature difference between the middle air duct and the outermost air duct is less than 5°C.

[0013] As a preferred embodiment of the converter cabinet structure of the present invention, wherein: a third air inlet is provided on the bottom wall panel of the lower heat dissipation area, a fourth air inlet is provided on the front wall panel, and a third air outlet is provided on the rear wall panel; the total area of ​​the third air inlet and the fourth air inlet is more than three times the total area of ​​the first air inlet and the second air inlet.

[0014] As a preferred embodiment of the converter cabinet structure of the present invention, the lower heat dissipation area and the upper heat dissipation area are isolated from each other; the central area of ​​the third air inlet, the fourth air inlet, and the third air outlet is provided with a device heat dissipation duct.

[0015] As a preferred embodiment of the converter cabinet structure of the present invention, the lower heat dissipation area is provided with a pull-out module tray, the bottom plate of the tray has an opening ratio of more than 40%, and a jet cooling gap is formed between it and the bottom air intake component.

[0016] As a preferred embodiment of the converter cabinet structure of the present invention, the cabinet is further divided into a second accommodating space and a third accommodating space, and the first accommodating space, the second accommodating space and the third accommodating space are arranged side by side along the height direction of the cabinet; each accommodating space has a wire hole at its edge for cable isolation and routing; the bottom of the second accommodating space and the third accommodating space are each provided with an independent air inlet, and the back wall panel is equipped with an independent cooling fan, forming a parallel heat dissipation path that does not interfere with the first accommodating space.

[0017] The beneficial effects of the converter cabinet structure of this invention are as follows: By setting up strip-shaped air ducts with varying horizontal gradients and coordinating with the diversion and guiding structure and the design of the venting gap, a precise match between heat dissipation resources and heat source density is achieved. While ensuring that the mass flow rate deviation of each air duct is less than 8%, it can effectively eliminate turbulence and heat dissipation dead zones in the wide cavity and reduce the temperature difference in the core area. Combined with the independent heat dissipation paths with physical isolation between the upper and lower layers, the high-opening-ratio pull-out module tray with jet cooling effect, and the parallel architecture with multiple accommodating spaces, the heat exchange efficiency and operational reliability of power devices are enhanced while improving the functional integration per unit space. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a front view of the converter cabinet structure.

[0020] Figure 2 This is a schematic diagram of the air duct structure of the converter cabinet.

[0021] Figure 3 This is a schematic diagram of the internal structure of the converter cabinet.

[0022] Figure 4 This is a schematic diagram of the first accommodating space structure of the converter cabinet.

[0023] Figure 5 This is a schematic diagram of the second and third accommodating spaces of the converter cabinet structure. Detailed Implementation

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0027] Example 1, referring to Figures 1 to 3 This is the first embodiment of the present invention, which provides a converter cabinet structure, including a cabinet 100, the interior of which is divided into several accommodating spaces. By partitioning the interior of the cabinet 100, it is divided into independent accommodating spaces that undertake different electrical functions and heat dissipation loads, and electromagnetic interference is prevented through spatial isolation; the first accommodating space 101 is divided by a horizontal partition 104 into an upper heat dissipation area 200 and a lower heat dissipation area 300 stacked vertically; a plurality of parallel guide plates 201 are arranged laterally along the cabinet 100, and the guide plates 201, together with the horizontal partition 104 and the top plate, front wall and side wall of the first accommodating space 101, define a plurality of strip-shaped air ducts N. 1. Inside the upper heat dissipation area 200, six horizontally parallel guide plates 201 and the enclosure wall of the cabinet 100 form a closed strip-shaped air duct N1, which forces the airflow through it to be confined within a specific path, preventing the turbulence and local dead zone phenomena commonly found inside wide cavities. The inlet of each strip-shaped air duct N1 is simultaneously connected to the first air inlet 202 and the second air inlet 203, and the outlet is provided with the first air outlet 204 and the second air outlet 205. The cross-sectional area of ​​the multiple strip-shaped air ducts N1 varies in a gradient along the horizontal direction, with the middle air duct having the largest cross-sectional area and the cross-sectional areas of the two side air ducts decreasing step by step. The ratio of the cross-sectional area S4 of the middle air duct to the cross-sectional area S1 of the outermost air duct is 9:7.

[0028] To address the most intense heat generation in the power devices at the center of the converter, the cross-sectional areas of the seven air ducts are arranged in a gradient of 9:8.3:7.6:7. By setting the area of ​​the middle air duct S4 to the maximum, the flow resistance coefficient of the central flow duct can be effectively reduced, attracting more cooling airflow to the core area. The cross-sectional areas of the two side air ducts gradually decrease to a ratio of 7, thereby increasing the flow velocity by reducing the cross-section and ensuring that there is still sufficient convective heat transfer intensity in the edge area at the end of the air duct.

[0029] Specifically, the middle air duct has the largest cross-sectional area, which aims to reduce flow resistance and guide a large amount of cold air to the core power devices that generate intense heat. The cross-sectional areas of the air ducts on both sides decrease step by step, using the narrowing effect to increase the flow velocity and ensure that the edge area has sufficient convective heat transfer intensity. This design, together with the baffle plate 201 constraint, effectively eliminates turbulence and heat dissipation dead zones in the wide cavity, and realizes precise on-demand allocation of heat dissipation resources.

[0030] It also includes a flow distribution structure 400, located downstream of the first air inlet 202 and the second air inlet 203, used to evenly distribute the airflow from the two air inlets to multiple strip-shaped air ducts N1, ensuring that the mass flow rate deviation at the inlet of each air duct is less than ±8%. The flow distribution structure 400, located downstream of the air inlets, acts as a flow field regulator, using the pressure difference of the dynamic gradient air ducts to guide the converging airflow smoothly into the seven channels. This structure, combined with an area distribution of 9:8.3:7.6:7, further enhances its effectiveness. The solution can control the mass flow rate deviation of each air duct inlet within ±6.5%, which is the preferred option and achieves extremely high cooling resource allocation accuracy. In this solution, the preferred number of guide plates 201 is six and the number of strip air ducts is seven. Adjacent strip air ducts are separated by guide plates 201. The tail of the guide plate 201 is provided with a venting notch 201a. The area of ​​the venting notch 201a is less than 3% of the area of ​​the guide plate 201. The venting notch 201a at the tail of the guide plate 201 serves as a fine-tuning means of pressure balance, allowing a small amount of fluid exchange between adjacent air ducts. Since its area ratio is controlled to be less than 3%, it can effectively eliminate static pressure fluctuations caused by gradient area differences, reduce airflow whistling, and will not disrupt the overall gradient airflow distribution logic.

[0031] For the design of gradient air ducts in converters, in order to find the optimal air duct division accuracy, we compared the overall performance of different air duct level configurations from the macro-architecture level, that is, the number of air ducts divided by the guide plate 201, and made the best selection.

[0032] The table below compares the duct configurations of levels 3, 5, 7, 9, and 11 to demonstrate the impact of duct division accuracy on airflow balance, temperature control effect, and structural complexity.

[0033] Table 1. Comparison of Functions and Performance Between Stages in a Multi-Stage Cooling System

[0034] Based on the comparison in the table above, we can derive the evolution pattern of gradient airflow configuration: non-linear improvement in temperature control accuracy: from level three to level seven, the maximum temperature difference drops sharply from 12.5℃ to 3.2℃, a significant decrease. However, beyond level seven, the improvement in temperature control accuracy is only between 0.4 and 0.7℃, entering the performance saturation zone.

[0035] The optimal threshold for flow consistency is ±6.5% under the seven-level configuration. Further increasing the number of levels has little contribution to the uniformity of the flow field. On the contrary, it will reduce the effective air passage area because the guide vane 201 occupies physical space.

[0036] The table below compares the configurations of ducts at levels 3, 5, 7, and 9 to demonstrate the impact of duct level on outlet static pressure stability and inter-stage interference coefficient.

[0037] Table 2. Comparison of Interstage Flow Distribution and Performance of Multistage Cooling Systems

[0038] The seven-stage structure exhibits the best performance in terms of outlet static pressure stability.

[0039] The table below compares the control of the junction temperature of the core heat source and the global thermal equilibrium under different gradient precision levels.

[0040] Table 3. Comparison of the variation patterns of thermodynamic energy efficiency and temperature control accuracy

[0041] In the macroscopic system architecture, the increase in the number of stages means an increase in the density of the guide vanes 201. The seven-stage system, combined with the venting gaps 201a covering less than 3% of the area, can form a micro-pressure difference balance between adjacent air ducts, effectively eliminating turbulence and flutter when high-speed airflow passes through a wide cavity. Compared to low-stage systems, where excessively wide channels easily generate large-scale eddies, and ultra-high-stage systems, where excessively narrow channels lead to a surge in wall viscous drag, the seven-stage structure exhibits the best performance in terms of outlet static pressure stability, with the lowest measured noise and vibration displacement.

[0042] Comparative analysis has shown that the seven-stage gradient air duct configuration of 9:8.3:7.6:7 is the optimal configuration that balances manufacturing feasibility, fluid stability, and thermal management accuracy. It maintains the lowest energy consumption and the optimal structural compactness while ensuring a temperature difference of less than 5°C.

[0043] In summary, spatial matching of heat dissipation resources and heat source density was achieved without the need for complex sensors.

[0044] Example 2, refer to Figures 1-5 This is the second embodiment of the present invention. Unlike the previous embodiment, a first exhaust fan 206 and a second exhaust fan 207 are fixedly connected to the first air outlet 204 and the second air outlet 205, respectively.

[0045] The first exhaust fan 206 and the second exhaust fan 207 are installed at the upper outlet end. They create a negative pressure environment in the air duct through strong suction. Compared with the push-type heat dissipation, the pull-type heat dissipation mode can more evenly drive the airflow in the gradient air duct and avoid the accumulation of airflow at the inlet end.

[0046] Both the first exhaust fan 206 and the second exhaust fan 207 are PWM speed-regulating fans, and a temperature sensor is installed in the middle air duct. The output signal of the temperature sensor is used to regulate the speed of the two exhaust fans in a closed loop so that the temperature difference between the middle air duct and the outermost air duct is less than 5℃.

[0047] Furthermore, in conjunction with PWM speed control technology, the system forms a highly sensitive closed-loop thermal control network. Temperature sensors monitor the core temperature rise of the central air duct in real time. When the load increases and causes the temperature in the central area to rise, the speed is increased. The air duct gradient structure of 9:8.3:7.6:7 provides greater cooling capacity redundancy to the central area, reduces the maximum temperature difference between the air ducts of the entire cabinet, achieves thermal field consistency, and thus improves the heat dissipation effect on the internal components of the cabinet.

[0048] The bottom wall panel of the lower heat dissipation area 300 has a third air inlet 301, the front wall panel has a fourth air inlet 302, and the rear wall panel has a third air outlet 303; the total area of ​​the third air inlet 301 and the fourth air inlet 302 is more than three times the total area of ​​the first air inlet 202 and the second air inlet 203.

[0049] Furthermore, the lower heat dissipation zone 300 carries the main power converter module, and its total air inlet area is designed to be three times that of the upper air inlet area. This significant difference in air inlet cross-sectional area creates a stable pressure differential step between the upper heat dissipation zone 200 and the lower heat dissipation zone 300, ensuring that cold air can penetrate the high-density heat-generating elements in the lower layer with a larger flow rate.

[0050] The lower heat dissipation area 300 and the upper heat dissipation area 200 are isolated from each other; the central area of ​​the third air inlet 301, the fourth air inlet 302, and the third air outlet 303 is provided with a device heat dissipation air duct N2.

[0051] The rest of the structure is the same as in Example 1.

[0052] In summary, the two heat dissipation zones are physically isolated in space and each has its own independent flow path. The device heat dissipation air duct N2 in the central area is specifically responsible for the forced convection of the core conversion unit, ensuring that heat is not conducted laterally between the upper and lower layers, thereby avoiding local heat accumulation.

[0053] Example 3, referring to Figures 1-5This is the third embodiment of the present invention. Unlike the previous embodiment, the lower heat dissipation area 300 is provided with a pull-out module tray. The bottom plate of the tray has an opening rate of more than 40%, and a jet cooling gap is formed between it and the bottom air intake component.

[0054] Specifically, in order to achieve the ultimate heat dissipation efficiency, the bottom of the pull-out tray adopts an ultra-high opening ratio of more than 40%. This design, together with the continuous suction generated at the outlet by the gradient air duct, forms a high-speed jet flow at the bottom of the tray. This jet cooling effect increases the surface heat transfer coefficient of the power device heat sink and enhances the heat dissipation limit under the compact layout.

[0055] The cabinet 100 is further divided into a second accommodating space 102 and a third accommodating space 103. The first accommodating space 101, the second accommodating space 102 and the third accommodating space 103 are arranged side by side along the height of the cabinet 100. Each accommodating space has a wire hole at its edge for cable isolation and routing. The bottom of the second accommodating space 102 and the third accommodating space 103 are each provided with an independent air inlet, and the back panel is equipped with an independent cooling fan, forming a parallel heat dissipation path that does not interfere with the first accommodating space 101.

[0056] Furthermore, the converter adopts a modular parallel architecture, with the second accommodating space 102 and the third accommodating space 103 arranged in an orderly manner along the height direction. This structure not only facilitates the isolation and routing of cables, but also ensures that each accommodating space has a similar cooling air acquisition path.

[0057] The rest of the structure is the same as in Example 2.

[0058] In summary, by using tray jet technology and a fully parallel heat dissipation path, the maintenance difficulties and thermal coupling problems caused by high integration were solved, ultimately forming a stable and reliable converter cabinet 100 structure.

[0059] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0060] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the invention as currently considered, or those features that are not relevant to implementing the invention) may be omitted.

[0061] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0062] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A converter cabinet structure, characterized in that: include, The cabinet (100) is divided into several storage spaces inside; The first accommodating space (101) is divided by a horizontal partition (104) into an upper heat dissipation area (200) and a lower heat dissipation area (300) stacked on top of each other. Multiple parallel guide plates (201) are arranged horizontally along the cabinet (100). The guide plates (201), together with the horizontal partition (104) and the top plate, front wall and side wall of the first accommodating space (101), define multiple strip-shaped air ducts (N1). The inlet of each strip-shaped air duct (N1) is connected to the first air inlet (202) and the second air inlet (203), and the outlet is provided with the first air outlet (204) and the second air outlet (205). The cross-sectional area of ​​the multiple strip-shaped air ducts (N1) varies in a gradient along the lateral direction, with the middle air duct having the largest cross-sectional area and the cross-sectional areas of the two side air ducts decreasing step by step. The ratio of the cross-sectional area S4 of the middle air duct to the cross-sectional area S1 of the outermost air duct is 9:

7.

2. The converter cabinet structure as described in claim 1, characterized in that: It also includes a diversion and flow guiding structure (400), which is located downstream of the first air inlet (202) and the second air inlet (203) to evenly distribute the airflow from the two air inlets to the multiple strip air ducts (N1) so that the mass flow rate deviation of each air duct inlet is less than ±8%.

3. The converter cabinet structure as described in claim 2, characterized in that: The number of the guide plates (201) is six, the number of the strip air ducts (N1) is seven, and the two adjacent strip air ducts (N1) are separated by the guide plates (201).

4. The converter cabinet structure as described in claim 3, characterized in that: The guide plate (201) has a discharge notch (201a) at its tail end, and the area of ​​the discharge notch (201a) is less than 3% of the area of ​​the guide plate (201).

5. The converter cabinet structure as described in claim 4, characterized in that: A first exhaust fan (206) and a second exhaust fan (207) are fixedly connected to the first air outlet (204) and the second air outlet (205), respectively.

6. The converter cabinet structure as described in claim 5, characterized in that: Both the first exhaust fan (206) and the second exhaust fan (207) are PWM speed-regulating fans, and a temperature sensor is provided in the middle air duct. The output signal of the temperature sensor is used to adjust the speed of the two exhaust fans in a closed loop so that the temperature difference between the middle air duct and the outermost air duct is less than 5°C.

7. The converter cabinet structure as described in claim 6, characterized in that: The lower heat dissipation area (300) has a third air inlet (301) on the bottom wall panel, a fourth air inlet (302) on the front wall panel, and a third air outlet (303) on the rear wall panel. The total area of ​​the third air inlet (301) and the fourth air inlet (302) is more than three times the total area of ​​the first air inlet (202) and the second air inlet (203).

8. The converter cabinet structure as described in claim 7, characterized in that: The lower heat dissipation area (300) and the upper heat dissipation area (200) are isolated from each other; The central area of ​​the third air inlet (301), the fourth air inlet (302), and the third air outlet (303) is provided with a device heat dissipation air duct (N2).

9. The converter cabinet structure as described in claim 8, characterized in that: The lower heat dissipation area (300) is provided with a pull-out module tray, the bottom plate of the tray has an opening ratio of more than 40%, and a jet cooling gap is formed between it and the bottom air intake component.

10. The converter cabinet structure as described in claim 9, characterized in that: The cabinet (100) is further divided into a second accommodating space (102) and a third accommodating space (103). The first accommodating space (101), the second accommodating space (102) and the third accommodating space (103) are arranged side by side along the height direction of the cabinet (100). Each accommodating space has a wire hole at its edge for cable isolation and routing; The bottom of the second accommodating space (102) and the third accommodating space (103) are each provided with an independent air inlet, and the back wall panel is equipped with an independent heat dissipation fan, forming a parallel heat dissipation path that does not interfere with the first accommodating space (101).

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