A compact composite refrigeration converter cabinet

Abstract

This invention provides a compact composite cooling converter cabinet, comprising a switch cabinet and a power cabinet located on one side thereof. The switch cabinet is vertically divided into a top cabinet and a bottom cabinet. The power cabinet has power modules and capacitor modules on the upper layer and reactor modules on the lower layer. The converter cabinet is equipped with a composite cooling system, including a first heat exchange module located in the power cabinet and a second heat exchange module located in the switch cabinet. These two modules operate independently, each corresponding to a different heat-generating area. Cool air circulates in a closed loop within the cabinet, achieving thermal isolation. The first heat exchange module provides air-cooled heat exchange for the power modules, capacitor modules, and reactor modules, while the second heat exchange module cools the heat-generating components in the top and bottom cabinets respectively. This invention, through its layered layout and dual-module composite cooling, avoids crosstalk between hot and cold airflows, ensuring efficient heat dissipation while significantly improving space utilization. It overcomes the bulky drawbacks of traditional converters and is suitable for wind power converter scenarios with high requirements for compactness and reliability.

Description

Technical Field

[0001] This invention belongs to the field of electrical equipment technology, and specifically relates to a compact composite refrigeration converter cabinet. Background Technology

[0002] Converter cabinets are typically composed of power cabinets and switch cabinets, integrating numerous heat-generating components such as power modules and busbars. During operation, these components generate significant heat, which, if not dissipated in a timely manner, will directly impact equipment efficiency and operational reliability. Therefore, the cabinet interior must be equipped with appropriate heat dissipation structures to ensure stable operation of all components within their permissible temperature range.

[0003] However, while the introduction of heat dissipation components improves cooling capacity, it also significantly increases the space occupied within the cabinet. In particular, the arrangement of air ducts or liquid cooling pipes often becomes more complex as the power rating increases, with an increase in the number of pipes and their intersecting routes. This not only squeezes the limited internal volume but also places higher demands on component layout and maintenance access. This contradiction between space and heat dissipation has become a major bottleneck restricting the compact design of power converter cabinets, and there is an urgent need to find more efficient integrated heat dissipation solutions within a limited volume. Summary of the Invention

[0004] This invention provides a compact composite refrigeration converter cabinet, which aims to solve the problems of bulky cabinet size and loose internal structure caused by the large space occupied by heat dissipation components and complex piping layout in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a compact composite refrigeration converter cabinet, comprising: A switch cabinet, wherein the upper side of the switch cabinet is a top cabinet for installing a high heat dissipation module, and the lower side of the switch cabinet is a bottom cabinet for installing a low heat dissipation module. A power cabinet is located on one side of the switch cabinet. A power module and a capacitor module are installed on the upper side of the power cabinet, and a reactor module is installed on the lower side of the power cabinet. A heat exchange module is also installed between the power cabinet and the switch cabinet. The heat exchange module includes a first heat exchange module located between the capacitor module, the power module and the reactor module. The first heat exchange module is used to perform forced air cooling and liquid cooling heat exchange on the capacitor module and the reactor module. The heat exchange module also includes a second heat exchange module located between the high heat dissipation module and the low heat dissipation module. The second heat exchange module is used to perform forced air cooling and liquid cooling heat exchange on the high heat dissipation module and the low heat dissipation module.

[0006] In one possible implementation, the power cabinet is fixedly equipped with a liquid supply pipe for supplying the refrigerant and a liquid return pipe for recovering the refrigerant, and the first heat exchange module includes: The first heat exchanger has its inlet end connected to the liquid delivery pipe and its outlet end connected to the liquid return pipe, and is located below the capacitor module and the power module. A first fan is installed on the lower side of the first heat exchanger and is configured to guide the airflow cooled by the first heat exchanger to the power module and the capacitor module. The second heat exchanger has its inlet end connected to the liquid delivery pipe and its outlet end connected to the liquid return pipe, and is located above the reactor module. The second fan is installed on the upper side of the second heat exchanger and is configured to guide the airflow cooled by the second heat exchanger to the reactor module.

[0007] In one possible implementation, the power modules are arranged at intervals along the front-rear direction of the power cabinet to form a return air channel communicating with the air inlet of the first fan, and the air outlet of the first fan is set facing the power modules on both sides.

[0008] In one possible implementation, the capacitor module and the power module are spaced apart from the top of the power cabinet to form a mounting compartment for accommodating electrical components, and the front and rear sides of the mounting compartment are connected.

[0009] In one possible implementation, the capacitor module is installed inside the return air duct, and the bottom side of the capacitor module abuts against the top surface of the first heat exchanger. The first fan delivers the air passing through the first heat exchanger sequentially to the power module and the installation chamber, and then returns to the first heat exchanger through the return air duct.

[0010] In one possible implementation, the power module is equipped with multiple liquid cooling plates, the liquid inlet ends of the multiple liquid cooling plates are all connected to the liquid delivery pipe, and the liquid outlet ends of the multiple liquid cooling plates are all connected to the liquid return pipe.

[0011] In one possible implementation, the second heat exchange module includes: The third heat exchanger is installed in the middle of the front-to-back direction inside the top cabinet and is located in the middle of the vertical direction of the top cabinet. The liquid inlet of the third heat exchanger is connected to the liquid delivery pipe, and the liquid outlet is connected to the liquid return pipe. The third fan is installed above the third heat exchanger. The top cabinet is equipped with a circulating air duct. The two ends of the circulating air duct are connected to the air inlet and air outlet of the third fan, respectively, and the circulating air duct is arranged around the outside of the third heat exchanger and the third fan.

[0012] In one possible implementation, the high heat dissipation module includes a busbar module, a machine-side reactor module, and a filter module arranged sequentially inside the circulating air duct along the airflow direction. The busbar module and the filter module are located on the front and rear sides of the second heat exchange module, respectively, and the machine-side reactor module is located above the third heat exchanger and the third fan.

[0013] In one possible implementation, the second heat exchange module further includes: The fourth heat exchanger is installed on the lower side of the base cabinet. The liquid inlet of the fourth heat exchanger is connected to the liquid delivery pipe, and the liquid outlet is connected to the liquid return pipe. A fourth fan is installed above the fourth heat exchanger and is configured to guide the airflow cooled by the fourth heat exchanger into the interior of the base cabinet.

[0014] In one possible implementation, the base cabinet includes switch mounting cabinets and copper busbar mounting cabinets arranged adjacent to each other in the front-to-back direction. The fourth heat exchanger and the fourth fan are installed inside the switch mounting cabinet, and the air inlet and air outlet of the fourth fan are respectively connected to the bottom and top of the copper busbar mounting cabinet.

[0015] Compared with the prior art, the solution shown in this application includes a switch cabinet and a power cabinet, with the power cabinet fixedly connected to one side of the switch cabinet. The switch cabinet is vertically divided into an upper top cabinet and a lower bottom cabinet. High-heat heat dissipation modules are centrally installed in the top cabinet, and low-heat heat dissipation modules are installed in the bottom cabinet. Power modules and capacitor modules are installed in the upper area of ​​the power cabinet, and reactor modules are installed in the lower area. The heat exchange module includes a first heat exchange module and a second heat exchange module. The first heat exchange module is arranged inside the power cabinet and located between the capacitor module, power module, and reactor module. The second heat exchange module is arranged inside the switch cabinet and located between the top and bottom cabinets. The two sets of heat exchange modules provide independent thermal management for different heat-generating areas. The overall structure is neat and compact, and the components and pipelines are arranged along the side walls and corner spaces of the cabinet, without occupying the installation positions of core components.

[0016] Specifically, in this embodiment, after the equipment is powered on, the power module and reactor module generate a large amount of heat, and the capacitor module also experiences a significant temperature rise. The first heat exchange module initiates forced air cooling or liquid cooling to simultaneously remove the heat generated by the upper and lower heating elements in the power cabinet; at the same time, the second heat exchange module cools the high-heat-dissipation module and low-heat-dissipation module in the switch cabinet respectively, ensuring that both the top and bottom cabinets are maintained within their respective suitable operating temperature ranges. The two heat exchange modules operate relatively independently, achieving precise correspondence between the heat-generating area and the temperature-controlled area. Through the above-mentioned zoned composite cooling method, disorderly interference of hot and cold airflows within the cabinet is effectively avoided, significantly improving the utilization rate of the internal space of the cabinet while ensuring heat dissipation efficiency, and overcoming the bulky size defect caused by the complex heat dissipation structure of traditional converters. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of a compact composite refrigeration converter cabinet provided in an embodiment of the present invention; Figure 2 A cross-sectional view of the interior of the power cabinet provided in an embodiment of the present invention; Figure 3 An internal sectional view of the top cabinet provided in an embodiment of the present invention; Figure 4 An internal sectional view of the cabinet provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the connection structure between the liquid delivery pipe and the liquid return pipe provided in an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Power cabinet; 11. Power module; 12. Capacitor module; 13. Reactor module; 2. Switch cabinet; 21. Top cabinet; 22. Bottom cabinet; 221. Switch mounting cabinet; 222. Copper busbar mounting cabinet; 3. Heat exchange module; 31. First heat exchange module; 311. First heat exchanger; 312. First fan; 313. Second heat exchanger; 314. Second fan; 32. Second heat exchange module; 321. Third heat exchanger; 322. Third fan; 323. Fourth heat exchanger; 324. Fourth fan; 4. Liquid supply pipe; 5. Liquid return pipe; 6. Liquid cooling plate; 7. Busbar module; 8. Machine-side reactor module; 9. Filter module. Detailed Implementation

[0019] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0020] Please refer to the following: Figures 1 to 5The present invention will now describe the compact composite cooling converter cabinet. The compact composite cooling converter cabinet includes a switch cabinet 2, a power cabinet 1, and a heat exchange module 3. The upper side of the switch cabinet 2 is a top cabinet 21 for mounting a high-heat-dissipation module, and the lower side of the switch cabinet 2 is a bottom cabinet 22 for mounting a low-heat-dissipation module. The power cabinet 1 is located on one side of the switch cabinet 2. A power module 11 and a capacitor module 12 are mounted on the upper side of the power cabinet 1, and a reactor module 13 is mounted on the lower side of the power cabinet 1. The heat exchange module 3 includes a first heat exchange module 31 and a second heat exchange module 32. The first heat exchange module 31 is located between the capacitor module 12, the power module 11, and the reactor module 13, and is used for forced air cooling or liquid cooling heat exchange of the capacitor module 12 and the reactor module 13. The second heat exchange module 32 is located between the high-heat-dissipation module and the low-heat-dissipation module, and is used for forced air cooling and liquid cooling heat exchange of the high-heat-dissipation module and the low-heat-dissipation module.

[0021] The compact composite cooling converter cabinet provided in this embodiment, compared with the prior art, includes a switch cabinet 2 and a power cabinet 1, with the power cabinet 1 fixedly connected to one side of the switch cabinet 2. The switch cabinet 2 is vertically divided into an upper top cabinet 21 and a lower bottom cabinet 22. High heat dissipation modules are centrally installed in the top cabinet 21, and low heat dissipation modules are installed in the bottom cabinet 22. Power modules 11 and capacitor modules 12 are installed in the upper area of ​​the power cabinet 1, and reactor modules 13 are installed in the lower area of ​​the power cabinet 1. The heat exchange module 3 includes a first heat exchange module 31 and a second heat exchange module 32. The first heat exchange module 31 is arranged inside the power cabinet 1 and located between the capacitor module 12, the power module 11, and the reactor module 13. The second heat exchange module 32 is arranged inside the switch cabinet 2 and located between the top cabinet 21 and the bottom cabinet 22. The two heat exchange modules provide independent thermal management for different heat-generating areas. The overall structure is neat and compact, and the components and pipelines are arranged along the side walls and corners of the cabinet without occupying the installation positions of core components.

[0022] Specifically, in this embodiment, after the equipment is powered on, the power module 11 and reactor module 13 generate a large amount of heat, and the capacitor module 12 also experiences a significant temperature rise. The first heat exchange module 31 initiates forced air cooling or liquid cooling heat exchange to simultaneously remove the heat generated by the upper and lower heating elements in the power cabinet 1; at the same time, the second heat exchange module 32 cools the high-heat dissipation module and low-heat dissipation module in the switch cabinet 2 respectively, ensuring that the top cabinet 21 and the bottom cabinet 22 are maintained within their respective suitable operating temperature ranges. The two heat exchange modules work relatively independently, achieving a precise correspondence between the heat-generating area and the temperature-controlled area. Through the above-mentioned zoned composite cooling method, the disorderly flow of hot and cold air within the cabinet is effectively avoided, significantly improving the utilization rate of the internal space of the cabinet while ensuring heat dissipation efficiency, and overcoming the bulky size defect caused by the complex heat dissipation structure of traditional converters.

[0023] Specifically, in this embodiment, the power cabinet 1 is divided into upper and lower compartments. The upper compartment is used to install the power module 11 and the capacitor module 12, and the lower compartment is used to install the reactor module 13.

[0024] In some embodiments, the power cabinet 1 described above can be as follows: Figure 2 , Figure 5 The structure shown. See also... Figure 2 , Figure 5 The power cabinet 1 is fixedly equipped with a liquid supply pipe 4 for supplying the refrigerant and a liquid return pipe 5 for recovering the refrigerant. The first heat exchange module 31 includes a first heat exchanger 311, a first fan 312, a second heat exchanger 313, and a second fan 314. The inlet end of the first heat exchanger 311 is connected to the liquid supply pipe 4, and the outlet end is connected to the liquid return pipe 5. It is located below the capacitor module 12 and the power module 11. The first fan 312 is installed on the lower side of the first heat exchanger 311 and is configured to guide the airflow cooled by the first heat exchanger 311 to the power module 11 and the capacitor module 12. The inlet end of the second heat exchanger 313 is connected to the liquid supply pipe 4, and the outlet end is connected to the liquid return pipe 5. It is located above the reactor module 13. The second fan 314 is installed on the upper side of the second heat exchanger 313 and is configured to guide the airflow cooled by the second heat exchanger 313 to the reactor module 13.

[0025] The cold air output from the first heat exchanger 311 can form a first circulation flow in the upper part of the power cabinet 1 under the drive of the first fan 312; the first circulation flow passes through the power module 11 and the capacitor module 12 in sequence. The cold air output from the second heat exchanger 313, driven by the second fan 314, can form a second circulation flow in the lower half of the power cabinet 1, and the second circulation flow passes through the reactor module 13.

[0026] Specifically, in this embodiment, a liquid supply pipe 4 for supplying refrigerant and a liquid return pipe 5 for recovering refrigerant are fixedly installed on the power cabinet 1. Both the liquid supply pipe 4 and the liquid return pipe 5 are located at the middle of the power cabinet 1 along its height.

[0027] Specifically, in this embodiment, the first heat exchange module 31 includes a first heat exchanger 311, a first fan 312, a second heat exchanger 313, and a second fan 314. The inlet end of the first heat exchanger 311 is connected to the liquid delivery pipe 4, and the outlet end is connected to the liquid return pipe 5. The first heat exchanger 311 is fixedly installed below the capacitor module 12 and the power module 11. The first fan 312 is installed below the first heat exchanger 311, with its air outlet facing upwards. During operation, it guides the cooled airflow from the first heat exchanger 311 outwards to the area where the power module 11 and capacitor module 12 are located, providing forced air cooling heat exchange for the upper heat-generating components. The inlet end of the second heat exchanger 313 is also connected to the liquid delivery pipe 4, and the outlet end is connected to the liquid return pipe 5. The second heat exchanger 313 is fixedly installed above the reactor module 13. The second fan 314 is installed on the upper side of the second heat exchanger 313, and its air inlet direction is located on one side of the second heat exchanger 313. When running, it will direct the cold air cooled by the second heat exchanger 313 to the outside and guide it downward to the reactor module 13 to perform forced air cooling heat exchange on the lower heating device.

[0028] Preferably, in this embodiment, the first heat exchanger 311 is located below the power module 11 and the capacitor module 12, and the second heat exchanger 313 is located above the reactor module 13, so that both the first heat exchanger 311 and the second heat exchanger 313 are located close to the liquid delivery pipe 4 and the liquid return pipe 5, reducing the arrangement between the pipes and reducing the space occupied by the pipes inside the power cabinet 1.

[0029] Specifically, in this embodiment, after the device is powered on, the power module 11 and capacitor module 12 generate a large amount of heat during the power conversion process, and the reactor module 13 also experiences a significant temperature rise due to the current flowing through it. The external circulation system delivers refrigerant to the first heat exchanger 311 and the second heat exchanger 313 via the liquid delivery pipe 4. As the refrigerant flows through each heat exchanger, it exchanges heat with the surrounding air, causing the surface temperature of the heat exchanger to drop rapidly. After the first fan 312 starts, it blows the cooled airflow from the first heat exchanger 311 to the outside. The rising cold air flows over the surfaces of the power module 11 and capacitor module 12, carrying away the heat generated by the upper heating elements. At the same time, the second fan 314 blows the cooled airflow from the second heat exchanger 313 downwards. The cold air flows over the surface of the reactor module 13, cooling the lower heating elements. The hot air after heat exchange flows back into the second heat exchanger 313 for further cooling. After absorbing heat, the refrigerant flows back to the external circulation system through the return pipe 5 for a new round of cooling cycle, thereby continuously providing forced air cooling to the heat-generating components in the power cabinet 1.

[0030] By adopting the above-mentioned air-cooled heat exchange method with separate upper and lower partitions and independent air supply, the first heat exchanger 311 and the second heat exchanger 313 respectively cool different heat-generating elements on the upper and lower layers of the power cabinet 1, allowing the cold airflow to flow directionally within their respective areas without crosstalk. Compared with the traditional heat dissipation method of a single air duct running through the entire cabinet, this solution avoids the drawbacks of upper-layer hot air sinking and affecting lower-layer components or lower-layer hot air rising and reducing the heat dissipation effect of the upper layer. At the same time, the compact layout of the two sets of heat exchangers and fans makes full use of the central gap between the power module 11 and the reactor module 13, eliminating the need for additional independent air duct space. While ensuring heat dissipation uniformity and efficiency, the volume occupied by the heat dissipation structure is greatly reduced, effectively solving the problem of bulky cabinet size caused by the long and winding heat dissipation air ducts in existing converter cabinets, and maximizing the utilization of space resources within the power cabinet 1.

[0031] In some embodiments, the power cabinet 1 described above can be as follows: Figure 2 , Figure 5 The structure shown. See also... Figure 2 , Figure 5 Power modules 11 are arranged at intervals along the front-to-back direction of power cabinet 1 to form a return air channel communicating with the air inlet of the first fan 312. The air outlet of the first fan 312 faces the power modules 11 on both sides. There are two first fans 312, which are installed side by side on the lower side of the first heat exchanger 311, and the air outlets of the two first fans 312 face opposite directions, i.e., they are arranged back to back. The cold air cooled by the first heat exchanger 311 is drawn in through the air inlets of the two first fans 312, pressurized by the fans, and blown outward from the two back-to-back air outlets. The cold air flows horizontally to the surface of the power modules 11 located on the left and right sides of the power cabinet 1, performing forced air cooling heat exchange on the power modules 11. The hot air that rises in temperature after flowing over the surface of the power module 11 flows back to the air inlet of the first fan 312 through the return air channel formed between adjacent power modules 11. After being cooled again by the first heat exchanger 311, it circulates to participate in heat dissipation, thus forming an internal circulation air path in the upper area of ​​the power cabinet 1 where cold air is sent out horizontally and returned along the vertical return air channel.

[0032] Specifically, in this embodiment, after the device is powered on, the power module 11 generates a large amount of heat during the power conversion process. Two first fans 312 are positioned back-to-back, simultaneously guiding the cooled air from the first heat exchanger 311 to the power modules 11 on both sides, achieving synchronous cooling of the power modules 11 on both sides. Because the air outlets of the two first fans 312 are arranged back-to-back, the cold airflow is split from the middle to both sides, avoiding the problem of insufficient airflow at the end due to excessively long air path when a single fan delivers air, ensuring that the surface of each power module 11 receives sufficient cold air coverage. The hot air that absorbs heat after flowing over the surface of the power module 11 flows back to the air inlet of the first fan 312 through the return air channel between adjacent power modules 11, where it exchanges heat again with the first heat exchanger 311 and rejoins the circulating cooling process. The aforementioned return air channel is naturally formed by the spacing of the power modules 11 themselves, eliminating the need for additional independent return air ducts. This achieves directional circulation of cold air without increasing the internal space occupied by the cabinet, further improving the heat dissipation efficiency and space utilization of the upper area of ​​the power cabinet 1.

[0033] In some embodiments, the power cabinet 1 described above can be as follows: Figure 2 The structure shown. See also Figure 2 The capacitor module 12 and power module 11 are spaced apart from the top of the power cabinet 1 to form a mounting compartment for accommodating electrical components. The front and rear sides of the mounting compartment are connected. The capacitor module 12 and power module 11 are spaced apart from the inner top wall of the power cabinet 1, and the space between them constitutes the mounting compartment for accommodating electrical components. This mounting compartment runs through the power cabinet 1 in the front-to-back direction, meaning that both the front and rear sides of the mounting compartment are open and interconnected. By mounting the capacitor module 12 and power module 11 relative to the top of the cabinet, a continuous and open space is naturally formed in the top area of ​​the cabinet, which can be used to lay control cables, signal harnesses, busbar connectors, and other auxiliary electrical components. The front-to-back connection design of the mounting compartment allows cables to be freely run through it in the front-to-back direction without the need for additional independent cable trays or conduit channels on the top of the cabinet. It also facilitates maintenance personnel to visually inspect and perform maintenance on the components inside the compartment from both the front and rear sides of the cabinet. During equipment operation, the various electrical components housed in the installation compartment also generate heat. Because the front and rear sides of the installation compartment are interconnected, the space inside maintains airflow communication with the external environment on both sides of the cabinet. During cold air circulation, a small amount of cold air can flow through the installation compartment to assist in heat dissipation for the cables and auxiliary components installed inside, preventing localized heat accumulation. Simultaneously, the installation compartment is located above the capacitor module 12 and power module 11, forming a staggered arrangement with the upper return air duct of the power cabinet 1, ensuring no interference between them. This fully utilizes the space at the top of the power cabinet 1, a space traditionally often left unused or merely used as a closed cover. Through a structured design of the inherent gap between the top of the cabinet and the heat-generating components, a regular area is provided for auxiliary electrical components without increasing the cabinet's height or width, further maximizing the potential of the limited space within the cabinet and improving the overall layout's efficiency.

[0034] In some embodiments, the power cabinet 1 described above can be as follows: Figure 2 The structure shown. See also Figure 2 The capacitor module 12 is installed inside the return air duct, and the bottom side of the capacitor module 12 abuts against the top surface of the first heat exchanger 311. The first fan 312 delivers the air passing through the first heat exchanger 311 to the power module 11 and the installation chamber in sequence, and then returns to the first heat exchanger 311 through the return air duct.

[0035] In this embodiment, by directly placing the capacitor module 12 within the return air duct and above the first heat exchanger 311, the capacitor module 12 not only gains stable support and positioning with the help of the top surface of the first heat exchanger 311, but also directly utilizes the cold air transfer from the surface of the first heat exchanger 311 for contact-assisted cooling. In the specific airflow path, the first fan 312 delivers the air cooled by the first heat exchanger 311 to the outside. The cold air first flows over the surface of the power module 11, carrying away its heat, and then continues to flow upward into the installation chamber, providing auxiliary heat dissipation for the electrical components and cables installed inside the chamber. Subsequently, the heated air flows downward through the return air duct back to the first heat exchanger 311, where it is cooled again by the refrigerant and circulates to participate in heat dissipation, forming a complete closed-loop internal airflow path.

[0036] Specifically, in this embodiment, during normal operation, the power module 11, as the main heat-generating element, generates a large amount of heat, and the capacitor module 12 also experiences a temperature rise. After the first fan 312 starts, cold air flows sequentially through the power module 11 and the mounting chamber, achieving step-by-step cooling of different heat-generating elements in the upper area. The bottom side of the capacitor module 12 directly abuts against the top surface of the first heat exchanger 311, transferring its own heat to the first heat exchanger 311 through heat conduction, where it is carried away by the refrigerant. At the same time, the circulating air flowing through the return air channel also performs convective heat exchange on the peripheral surface of the capacitor module 12, forming a multi-dimensional cooling mode with the combined effect of contact conduction and convective heat dissipation.

[0037] Furthermore, since the capacitor module 12 is housed inside the return air duct, there is no need to allocate an additional independent installation position in the upper area of ​​the power cabinet 1, further simplifying the internal layout. The series airflow design, in which cold air flows sequentially through the power module 11 and the installation compartment before returning to the first heat exchanger 311 via the return air duct, allows a single stream of cold air to serve multiple heat dissipation objects in sequence during the circulation path. This avoids the complexity of the air duct structure caused by multiple independent airflow paths running in parallel. While ensuring that each heat-generating element is effectively cooled, the internal air duct structure is simplified to the maximum extent, which is conducive to further reducing the overall volume of the power cabinet 1.

[0038] In some embodiments, the power module 11 described above may employ, for example... Figure 2 The structure shown. See also Figure 2 Multiple liquid-cooled plates 6 are installed on the power module 11. The liquid inlet of each liquid-cooled plate 6 is connected to the liquid delivery pipe 4, and the liquid outlet of each liquid-cooled plate 6 is connected to the liquid return pipe 5. Specifically, the external circulation system delivers refrigerant to each liquid-cooled plate 6 through the liquid delivery pipe 4. When the refrigerant flows through the liquid-cooled plate 6, it exchanges heat with the power module 11, quickly carrying away the large amount of heat generated by the operation of the power module 11. The refrigerant that has absorbed heat flows back to the external circulation system through the liquid outlet of each liquid-cooled plate 6 into the liquid return pipe 5.

[0039] By independently setting liquid cooling plates 6 on each power module 11, each power module 11 obtains an independent liquid cooling circuit. Compared with the solution of a single liquid cooling plate 6 providing heat dissipation for multiple power modules 11 at the same time, the independent liquid cooling method avoids the problem of the cooling effect of the terminal module being reduced due to the temperature rise along the way when the refrigerant flows through multiple modules. This ensures that each power module 11 can obtain sufficient liquid cooling heat dissipation capacity, which is especially suitable for the heat dissipation needs of multiple power modules 11 operating at high loads at the same time under high power conditions.

[0040] Specifically, in this embodiment, during operation, the power module 11 generates a large amount of heat during power conversion, which is independently cooled by each liquid cooling plate 6. Simultaneously, the first heat exchanger 311, in conjunction with the first fan 312, creates circulating cold air in the upper region of the power cabinet 1, providing forced air cooling heat exchange for the power module 11 and capacitor module 12. The liquid cooling plates 6 are installed close to the power module 11, and through refrigerant circulation, quickly remove the core heat of the power module 11, significantly reducing the temperature rise of the power module 11 itself and its radiative heat loss to the surrounding air.

[0041] Forced air cooling further removes residual heat from the surfaces of the power module 11 and capacitor module 12, as well as heat generated from the surrounding connecting busbars. Liquid cooling handles the rapid removal of most of the heat from the power module 11, while air cooling is responsible for overall temperature control of the area and targeted cooling of the capacitor module 12; the two complement each other. In particular, the bottom side of the capacitor module 12 is directly in contact with the top surface of the first heat exchanger 311, receiving direct cooling from the first heat exchanger 311 through contact conduction. Furthermore, it is continuously cooled by circulating cold air within the return air channel. Combined with the significant reduction in heat dissipation from the power module 11 to the air inside the cabinet after liquid cooling, the air temperature within the return air channel where the capacitor module 12 is located is maintained at a lower level, further enhancing the cooling effect of air cooling on the capacitor module 12.

[0042] Specifically, in this embodiment, liquid cooling directly removes the heat from the power module 11, the main heat source, from the outside of the cabinet, while air cooling circulates and cools the capacitor module 12 at a relatively lower ambient temperature. The synergistic effect of the dual mechanisms makes the heat dissipation effect of the capacitor module 12 significantly better than that of a single air cooling or liquid cooling solution, achieving an effective composite cooling gain effect. While ensuring efficient heat dissipation of the power module 11, it significantly improves the operating temperature environment of the capacitor module 12, which is conducive to extending the service life of the capacitor module 12 and improving the reliability of the whole machine operation.

[0043] In some embodiments, the second heat exchange module 32 described above can be adopted as follows: Figure 3 , Figure 5 The structure shown. See also... Figure 3 , Figure 5The second heat exchange module 32 includes a third heat exchanger 321 and a third fan 322. The third heat exchanger 321 is installed in the middle of the top cabinet 21 along the front-to-back direction and in the middle of the top cabinet 21 along the vertical direction. The liquid inlet of the third heat exchanger 321 is connected to the liquid delivery pipe 4, and the liquid outlet is connected to the liquid return pipe 5. The third fan 322 is installed above the third heat exchanger 321. A circulating air duct is provided inside the top cabinet 21. The two ends of the circulating air duct are connected to the air inlet and air outlet of the third fan 322, respectively, and the circulating air duct is arranged around the outside of the third heat exchanger 321 and the third fan 322. The external circulation system delivers refrigerant to the third heat exchanger 321 via the liquid delivery pipe 4. When the refrigerant flows through the third heat exchanger 321, it exchanges heat with the surrounding air to cool the air. The third fan 322 sends the cooled air out through one end of the circulation duct. The cold air flows along the duct and passes over the surface of the high heat dissipation module in the top cabinet 21 to carry away heat. The hot air that has absorbed heat flows back to the air inlet of the third fan 322 through the other end of the circulation duct. It is cooled again by the third heat exchanger 321 and then circulates to participate in heat dissipation, forming a closed circulation air path inside the top cabinet 21.

[0044] Specifically, in this embodiment, during operation, the high-heat-dissipation modules inside the top cabinet 21 generate a large amount of heat. The third heat exchanger 321 works in conjunction with the third fan 322 to guide cool air to the area where the high-heat-dissipation modules are located through a circulating air duct for forced air cooling heat exchange. The third heat exchanger 321 is located in the middle of the top cabinet 21, so that after the cool air is sent out by the third fan 322, it can flow along the circulating air duct to the high-heat-dissipation modules on the front and rear sides of the top cabinet 21, ensuring that all devices within the air duct coverage area can receive a uniform supply of cool air.

[0045] Specifically, in this embodiment, the circulating air duct is arranged around the outside of the third heat exchanger 321 and the third fan 322, making full use of the circumferential space between the third heat exchanger 321 and the inner wall of the top cabinet 21. This eliminates the need for additional independent duct components, allowing the duct structure, heat exchanger, and fan to form an integrated arrangement within the limited space of the top cabinet 21. Through this internal circulating air cooling method, the high-heat-dissipation modules inside the top cabinet 21 are effectively cooled, and the cold air circulates repeatedly within the closed air duct, preventing external impurities from entering the cabinet. This ensures effective heat dissipation while achieving highly efficient use of the space within the top cabinet 21.

[0046] In some embodiments, the switch cabinet 2 described above can be adopted as follows: Figure 3 The structure shown. See also Figure 3The high heat dissipation module includes a busbar module 7, a machine-side reactor module 8, and a filter module 9, which are sequentially arranged inside the circulating air duct along the airflow direction. The busbar module 7 and the filter module 9 are located on the front and rear sides of the second heat exchange module 32, respectively, and the machine-side reactor module 8 is located above the third heat exchanger 321 and the third fan 322. In this embodiment, the high heat dissipation module includes a busbar module 7, a machine-side reactor module 8, and a filter module 9, which are sequentially arranged inside the circulating air duct along the airflow direction.

[0047] The busbar module 7 and the filter module 9 are located on opposite sides of the third heat exchanger 321 and the third fan 322 along the front-rear direction of the switchgear 2, respectively. Specifically, they are positioned in front of and behind the third heat exchanger 321 and the third fan 322. The unit-side reactor module 8 is located above the third heat exchanger 321 and the third fan 322. Through this layout, the busbar module 7, the unit-side reactor module 8, and the filter module 9 are arranged around the third heat exchanger 321 and the third fan 322 within the top cabinet 21, ensuring a short airflow path between each heat-generating device and the third heat exchanger 321. After the third fan 322 is started, the cold air cooled by the third heat exchanger 321 flows through the busbar module 7, the machine-side reactor module 8 and the filter module 9 in sequence along the circulating air duct, and cools the three of them in stages. The hot air that has absorbed heat flows back to the third heat exchanger 321 through the circulating air duct to cool down again, forming an annular internal circulating air path that flows around the second heat exchange module 32.

[0048] In this embodiment, the busbar module 7, the machine-side reactor module 8, and the filter module 9 are arranged sequentially in the circulating air duct along the airflow direction, with their heat dissipation intensity increasing sequentially. The busbar module 7 has low resistance loss and low heat dissipation, and its placement at the front end of the air duct has minimal impact on the temperature rise of the cold air. The machine-side reactor module 8 is located in the middle, and its copper and iron losses can be effectively carried away by the cold air. The filter module 9 has the highest heat generation rate per unit volume and is sensitive to temperature, so it is placed at the end, where the cold air is still within the effective cooling range. This gradient series arrangement enables on-demand distribution of cooling capacity, meeting the cooling needs of devices with different heat dissipation in a single air duct. This avoids the problem of downstream cold air overheating caused by placing high-heat-generating devices at the front, and simplifies the air duct structure while ensuring balanced heat dissipation.

[0049] In some embodiments, the second heat exchange module 32 described above can be adopted as follows: Figure 4 , Figure 5 The structure shown. See also... Figure 4 , Figure 5 The second heat exchange module 32 also includes a fourth heat exchanger 323 and a fourth fan 324. The fourth heat exchanger 323 is installed on the lower side of the base cabinet 22. The liquid inlet of the fourth heat exchanger 323 is connected to the liquid delivery pipe 4, and the liquid outlet is connected to the liquid return pipe 5. The fourth fan 324 is installed above the fourth heat exchanger 323 and is configured to guide the airflow cooled by the fourth heat exchanger 323 into the interior of the base cabinet 22.

[0050] Specifically, in this embodiment, the external circulation system delivers refrigerant to the fourth heat exchanger 323 via the liquid delivery pipe 4. As the refrigerant flows through the fourth heat exchanger 323, it exchanges heat with the surrounding air, cooling the air. After the fourth fan 324 starts, it blows the cooled airflow from the fourth heat exchanger 323 towards one side of the cabinet 22, forcibly cooling the low-heat-dissipation modules installed inside the cabinet 22. The heated air, after absorbing heat, flows naturally back to the fourth heat exchanger 323 for recooling, forming a closed-loop circulation path within the cabinet 22. By vertically stacking the fourth heat exchanger 323 on the lower side of the cabinet 22 and the fourth fan 324 above it, the cold air flows upwards through the entire cabinet 22 chamber, ensuring that the cooling airflow fully covers the installation areas of all components within the cabinet 22.

[0051] Specifically, in this embodiment, during actual operation, the low heat dissipation module in the bottom cabinet 22 will also generate a certain amount of heat. Although its heat generation is relatively lower than that of the high heat dissipation module in the top cabinet 21, if the heat accumulates and cannot be dissipated in time, it will still affect the operational stability and service life of precision weak electrical components such as control boards and communication modules.

[0052] The fourth heat exchanger 323 works in conjunction with the fourth fan 324 to deliver cool air from bottom to top into the cabinet 22. As the air rises, it flows over the surfaces of each low-heat-dissipation module, carrying away heat. The fourth heat exchanger 323 is installed on the lower side of the cabinet 22, making full use of the often-overlooked unused space at the bottom of the cabinet 22 in conventional designs. The fourth fan 324 is located above the fourth heat exchanger 323; the two are vertically and compactly stacked, without occupying any additional horizontal projection area of ​​the cabinet 22. This ensures that all components inside the cabinet 22 receive adequate cooling while maximizing the use of effective installation space within the cabinet 22. This allows the cabinet 22 to maintain good heat dissipation performance even when accommodating more functional components, further improving the overall space utilization of the cabinet.

[0053] In some embodiments, the base cabinet 22 may be adopted as follows: Figure 4 The structure shown. See also Figure 4The base cabinet 22 includes a switch mounting cabinet 221 and a copper busbar mounting cabinet 222 arranged adjacent to each other in the front-to-back direction. A fourth heat exchanger 323 and a fourth fan 324 are installed inside the switch mounting cabinet 221, and the air inlet and outlet of the fourth fan 324 are respectively connected to the bottom and top of the copper busbar mounting cabinet 222. An external circulation system delivers refrigerant to the fourth heat exchanger 323. After the fourth heat exchanger 323 cools the surrounding air, the fourth fan 324 sends the cold air through its outlet into the bottom of the copper busbar mounting cabinet 222. The cold air flows from bottom to top through the interior of the copper busbar mounting cabinet 222, performing forced air cooling heat exchange on the switch devices and copper busbars arranged inside the cabinet. The hot air that has absorbed heat flows back from the top of the copper busbar mounting cabinet 222 through the air inlet of the fourth fan 324 to the interior of the switch mounting cabinet 221, where it is cooled again by the fourth heat exchanger 323 and then circulates to participate in heat dissipation. By placing the fourth heat exchanger 323 and the fourth fan 324 inside the switch mounting cabinet 221, and the cooling object copper busbar mounting cabinet 222 forming a cross-cabinet airflow connection with the fourth fan 324 through the air inlet and air outlet, the separate cabinet arrangement of the heat exchange module 3 and the heat dissipation object is realized.

[0054] Specifically, in this embodiment, the switching devices and copper busbars inside the copper busbar mounting cabinet 222 generate significant heat during current transmission. After the fourth fan 324 starts, it sends cool air into the copper busbar mounting cabinet 222 from the bottom. The cool air flows upwards along the height of the cabinet, evenly carrying away heat from the copper busbars and switching devices as it flows over their surfaces. Hot air flows back from the top of the copper busbar mounting cabinet 222 to the air inlet of the fourth fan 324, enters the switch mounting cabinet 221, is cooled by the fourth heat exchanger 323, and then re-enters the circulation, forming a closed-loop internal airflow path across the cabinet.

[0055] Specifically, in this embodiment, the copper busbar mounting cabinet 222 does not require a separate heat exchanger and fan. Sufficient cooling air supply is obtained solely through the airflow connecting it to the adjacent switch mounting cabinet 221, allowing the entire internal space of the copper busbar mounting cabinet 222 to be used for installing electrical components without any heat dissipation equipment occupying the space. Simultaneously, the upward flow of cold air through the copper busbar mounting cabinet 222 fully utilizes the vertical space of the cabinet, ensuring that the rising air sequentially covers all components from bottom to top, achieving simultaneous optimization of space utilization and heat dissipation uniformity within the copper busbar mounting cabinet 222.

[0056] Preferably, in this embodiment, by arranging the switch mounting cabinet 221 and the copper busbar mounting cabinet 222 adjacent to each other, it facilitates cross-cabinet connection of copper busbars and cables between the two cabinets, effectively shortening the electrical path, reducing the amount of copper busbars and cables used, reducing line loss, and saving wiring space inside the cabinet. On the other hand, by installing the fourth fan 324 inside the relatively small-sized switch mounting cabinet 221, no additional fan installation space needs to be reserved in the copper busbar mounting cabinet 222, and its internal space can be used entirely for the layout of switch devices and copper busbars, further improving the space utilization of the copper busbar mounting cabinet 222. In addition, the fourth fan 324 is installed inside the switch mounting cabinet 221, and cross-cabinet air supply to the copper busbar mounting cabinet 222 can be achieved through the airflow connection structure between the two cabinets. This does not affect the dense arrangement of devices inside the copper busbar mounting cabinet 222, and avoids the volume expansion caused by adding heat dissipation equipment inside the copper busbar mounting cabinet 222. The method of sharing the heat dissipation module across cabinets achieves a dual intensive configuration of space resources and heat dissipation resources.

[0057] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A compact composite refrigeration converter cabinet, characterized in that, include: Switch cabinet (2), the upper side of the switch cabinet (2) is a top cabinet (21) for installing high heat dissipation modules, and the bottom side of the switch cabinet (2) is a bottom cabinet (22) for installing low heat dissipation modules; A power cabinet (1) is located on one side of the switch cabinet (2). A power module (11) and a capacitor module (12) are installed on the upper side of the power cabinet (1), and a reactor module (13) is installed on the lower side of the power cabinet (1). The heat exchange module (3) includes a first heat exchange module (31) and a second heat exchange module (32). The first heat exchange module (31) is located between the capacitor module (12), the power module (11) and the reactor module (13) and is used to perform forced air cooling and liquid cooling heat exchange on the capacitor module (12) and the reactor module (13). The second heat exchange module (32) is located between the high heat dissipation module and the low heat dissipation module and is used to perform forced air cooling and liquid cooling heat exchange on the high heat dissipation module and the low heat dissipation module.

2. The compact composite refrigeration converter cabinet as described in claim 1, characterized in that, The power cabinet (1) is fixedly equipped with a liquid supply pipe (4) for supplying the cold medium and a liquid return pipe (5) for recovering the cold medium. The first heat exchange module (31) includes: The first heat exchanger (311) has its inlet end connected to the liquid delivery pipe (4) and its outlet end connected to the return pipe (5), and is located below the capacitor module (12) and the power module (11). A first fan (312) is installed on the lower side of the first heat exchanger (311) and is configured to guide the airflow cooled by the first heat exchanger (311) to the power module (11) and the capacitor module (12); The second heat exchanger (313) has its inlet end connected to the liquid delivery pipe (4) and its outlet end connected to the return pipe (5), and is located above the reactor module (13). A second fan (314) is installed on the upper side of the second heat exchanger (313) and is configured to guide the airflow cooled by the second heat exchanger (313) to the reactor module (13); The cold air output by the first heat exchanger (311) is driven by the first fan (312) to form a first circulation flow in the upper part of the power cabinet (1); the first circulation flow passes through the power module (11) and the capacitor module (12) in sequence. The cold air output by the second heat exchanger (313) can form a second circulation flow in the lower half of the power cabinet (1) under the drive of the second fan (314), and the second circulation flow passes through the reactor module (13).

3. The compact composite refrigeration converter cabinet as described in claim 2, characterized in that, The power modules (11) are arranged at intervals along the front and rear direction of the power cabinet (1) to form a return air channel that communicates with the air inlet of the first fan (312). The air outlet of the first fan (312) is set towards the power modules (11) on both sides.

4. The compact composite refrigeration converter cabinet as described in claim 3, characterized in that, The capacitor module (12) and the power module (11) are spaced apart from the top of the power cabinet (1) to form an installation compartment for accommodating electrical components, and the front and rear sides of the installation compartment are connected.

5. The compact composite refrigeration converter cabinet as described in claim 4, characterized in that, The capacitor module (12) is installed inside the return air duct, and the bottom side of the capacitor module (12) abuts against the top surface of the first heat exchanger (311). The first fan (312) delivers the air passing through the first heat exchanger (311) to the power module (11) and the installation chamber in sequence, and then returns to the first heat exchanger (311) through the return air duct.

6. The compact composite refrigeration converter cabinet as described in claim 5, characterized in that, The power module (11) is equipped with multiple liquid cooling plates (6), the liquid inlet of the multiple liquid cooling plates (6) is connected to the liquid delivery pipe (4), and the liquid outlet of the multiple liquid cooling plates (6) is connected to the liquid return pipe (5).

7. The compact composite refrigeration converter cabinet as described in claim 2, characterized in that, The second heat exchange module (32) includes: The third heat exchanger (321) is installed in the middle of the front-to-back direction inside the top cabinet (21) and is located in the middle of the vertical direction of the top cabinet (21). The liquid inlet of the third heat exchanger (321) is connected to the liquid delivery pipe (4), and the liquid outlet is connected to the liquid return pipe (5). The third fan (322) is installed above the third heat exchanger (321). The top cabinet (21) is equipped with a circulating air duct. The two ends of the circulating air duct are connected to the air inlet and air outlet of the third fan (322) respectively, and the circulating air duct is arranged around the outside of the third heat exchanger (321) and the third fan (322).

8. The compact composite refrigeration converter cabinet as described in claim 7, characterized in that, The high heat dissipation module includes a busbar module (7), a machine-side reactor module (8), and a filter module (9) arranged sequentially inside the circulating air duct along the airflow direction. The busbar module (7) and the filter module (9) are located on the front and rear sides of the second heat exchange module (32), respectively. The machine-side reactor module (8) is located above the third heat exchanger (321) and the third fan (322).

9. The compact composite refrigeration converter cabinet as described in claim 7, characterized in that, The second heat exchange module (32) also includes: The fourth heat exchanger (323) is installed on the lower side of the cabinet (22). The liquid inlet of the fourth heat exchanger (323) is connected to the liquid delivery pipe (4), and the liquid outlet is connected to the liquid return pipe (5). A fourth fan (324) is installed above the fourth heat exchanger (323) and is configured to guide the airflow cooled by the fourth heat exchanger (323) into the interior of the cabinet (22).

10. The compact composite refrigeration converter cabinet as described in claim 9, characterized in that, The base cabinet (22) includes a switch mounting cabinet (221) and a copper busbar mounting cabinet (222) arranged adjacent to each other in the front-back direction. The fourth heat exchanger (323) and the fourth fan (324) are installed inside the switch mounting cabinet (221), and the air inlet and air outlet of the fourth fan (324) are respectively connected to the bottom and top of the copper busbar mounting cabinet (222).

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