Current switch cabinet based on two-way forced air cooling and collaborative cooling method

Abstract

This invention relates to the field of switchgear technology, specifically to a current switchgear based on dual-path forced air cooling and a synergistic heat dissipation method. The current switchgear includes a cabinet, a first air-cooling component, and a second air-cooling component. The cabinet is internally divided into a front lower compartment, a circuit breaker compartment, a busbar compartment, and a cable compartment. The busbar compartment has an upper contact group, and the cable compartment has a lower contact group, forming a lower contact interface within the circuit breaker compartment. The first air-cooling component includes a fan shroud and a first fan within the front lower compartment, as well as a first air supply duct and a second air supply duct leading to the circuit breaker compartment and the busbar compartment, respectively. The first air supply duct has a first air outlet that avoids the circuit breaker chassis, and the second air supply duct has a second air outlet facing the bottom of the upper contact group. The second air-cooling component includes fans at the top of the circuit breaker compartment and the busbar compartment. This invention, through the synergistic operation of dual-path air supply and the top fan, solves problems such as easily obstructed air outlets and the easy formation of negative pressure within the compartment, significantly improving the operational reliability of the switchgear.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of switch cabinets, and particularly relates to a current switch cabinet based on double-path forced air cooling and a collaborative heat dissipation method. BACKGROUND

[0002] As a key power distribution equipment in the power system, the long-term reliability of the metal-enclosed armored switch cabinet is crucial. With the continuous growth of power load, the rated current level of the switch cabinet is increasing, which leads to a significant increase in heat generated by the current thermal effect of elements such as the conductive bus and the circuit breaker contact in the cabinet. In order to ensure the operation safety and protection level, the cabinet structure of the switch cabinet is usually closed or semi-closed, and the internal heat cannot be dissipated naturally. Therefore, active heat dissipation technology such as forced air cooling must be relied on to control the temperature rise within the limit value specified in the national standard. Otherwise, it will accelerate the insulation aging, cause contact oxidation and even trigger thermal faults, which seriously threatens the safety of the power grid.

[0003] In the prior art, for the heat dissipation design of the high-current switch cabinet, the scheme of arranging an axial flow fan or a cross flow fan in the circuit breaker chamber is generally adopted. Specifically, the fan is usually directly installed on the partition plate below the circuit breaker chamber, and the expected heat dissipation path is as follows: the external environment cold air enters the "front lower chamber" through the grid hole provided on the front door of the cabinet and provided with a dust screen; then, the air in the front lower chamber is extracted by the fan on the partition plate, and is blown upward into the circuit breaker chamber, flows through the areas of the circuit breaker contact arm, the plum blossom contact and the contact box where the heat is most concentrated, and carries away the heat; finally, the hot air is discharged out of the cabinet through the cabinet top pressure relief channel under the cooperative suction action of the fan at the top of the circuit breaker chamber. This system based on a single air path and forming an air circulation from bottom to top in the cabinet is the mainstream technology for ensuring that the temperature rise of the switch cabinet meets the standard.

[0004] However, the prior art solution has several inherent and interrelated technical defects, which are difficult to meet the demand for heat dissipation efficiency under higher current density and more severe operating environment: (1) Since the fan is directly installed on the breaker chamber partition, the outlet of the fan is directly above the movable breaker chassis. When the breaker is in the "working position", the chassis will partially or even completely block the fan outlet, forming a blind area of air flow, greatly reducing the effective outlet area and wind speed, disturbing the expected air flow organization, and causing the contact area that needs cooling the most to be insufficient. The amount of wind, and the heat dissipation effect is greatly discounted; (2) The fan installed on the breaker chamber partition relies on the air supply inside the front lower chamber, and the front lower chamber can only exchange a limited amount of gas with the outside through the front door protective grid. When multiple fans are working at the same time, it is easy to cause the air in the front lower chamber to "out more than in", forming a negative pressure in the cavity. The negative pressure state will directly increase the suction resistance of the fan, reduce its working efficiency, and limit the total air intake. Especially, it will hinder the direct entry of external cold air with lower temperature into the high temperature area, and repeatedly circulate the already heated air, resulting in low overall heat dissipation efficiency: (3) The busbar chamber collects a large number of main conducting busbars, which are important heat sources. In order to meet the insulation or protection requirements under special working conditions, the side plate (large bending plate) is often not allowed or only a small number of openings are allowed, resulting in a serious lack of air intake. Although the top of the busbar chamber is usually also equipped with an exhaust device, it will also be affected by poor air intake, causing the entire busbar chamber to be in a state of strong negative pressure, with poor internal air flow and difficulty in effectively removing heat, becoming a weak link in the temperature control of the entire switch cabinet.

[0005] Therefore, how to break through the limitations of the existing single-path air cooling mode, effectively solve the problems of air outlet shielding, system negative pressure and insufficient air volume in key areas, and realize more efficient and controllable directional heat dissipation is a technical problem that needs to be solved in the field. SUMMARY

[0006] The application provides a current switch cabinet based on double-path forced air cooling and a cooperative heat dissipation method to solve the problem of difficult heat dissipation control of the switch cabinet due to low-efficiency internal single-path air cooling in the prior art.

[0007] In order to achieve the above-mentioned purpose, the application adopts the following technical solutions:

[0008] The application provides a current switch cabinet based on double-path forced air cooling, which comprises a cabinet body, a first air cooling assembly and a second air cooling assembly.

[0009] The cabinet body comprises a front lower chamber, a breaker chamber, a busbar chamber and a cable chamber arranged inside the cabinet body, the busbar chamber is provided with an upper contact group, the cable chamber is provided with a lower contact group, and the lower contact group is formed with a lower contact interface in the breaker chamber.

[0010] The first air cooling assembly comprises a fan cover, a first fan, a first air supply pipe and a second air supply pipe. The fan cover is fixedly arranged in the front lower chamber. An air inlet grid hole is arranged on the cabinet and communicates with the front lower chamber. A first air inlet is arranged on the fan cover and is adjacent to the air inlet grid hole. The first fan is fixedly arranged in the fan cover. The first air supply pipe communicates the air outlet side of the first fan with the circuit breaker chamber. The first air supply pipe forms a first air outlet in the circuit breaker chamber. The first air outlet avoids the chassis shielding area when the circuit breaker works and faces the lower contact head interface. The second air supply pipe communicates the air outlet side of the first fan with the busbar chamber. The second air supply pipe forms a second air outlet in the busbar chamber. The second air outlet faces the bottom of the upper contact head group.

[0011] The second air cooling assembly comprises a second fan and a third fan. The second fan is arranged on the top of the circuit breaker chamber and cooperates with the first air outlet to form forced convection in the circuit breaker chamber. The third fan is arranged on the top of the busbar chamber and cooperates with the second air outlet to form forced convection in the busbar chamber.

[0012] Optionally, an air flow channel is formed in the fan cover. The air flow channel sequentially comprises a diameter-expanded air inlet section, an expansion chamber and a diameter-reduced air outlet section along the air flow direction. The diameter-expanded air inlet section is provided with the horizontally-facing first air inlet. The first fan is fixedly arranged in the expansion chamber.

[0013] The fan cover comprises a first flow guide plate which guides the air flow obliquely downward between the diameter-expanded air inlet section and the expansion chamber, and a second flow guide plate which guides the air flow obliquely upward between the expansion chamber and the diameter-reduced air outlet section. The first air supply pipe and the second air supply pipe both communicate with the end of the diameter-reduced air outlet section.

[0014] Optionally, the circuit breaker chamber and the front lower chamber are isolated from the busbar chamber and the cable chamber by a first partition plate arranged vertically. The lower contact head group is fixedly arranged on the first partition plate and forms the lower contact head interface on the first partition plate. The circuit breaker chamber is located above the front lower chamber. The circuit breaker chamber and the front lower chamber are isolated by a second partition plate arranged horizontally. The fan cover comprises a top cover plate which is fixedly arranged on the bottom surface of the second partition plate.

[0015] The first air supply pipe is integrally communicated with the top cover plate and is fixedly arranged on the second partition plate. The first air supply pipe is arranged adjacent to the first partition plate in the circuit breaker chamber and is horizontally arranged along the width direction of the cabinet. The first air outlet is arranged along the length direction of the first air supply pipe. The air outlet direction of the first air outlet is vertically upward. A first grid hole plate is arranged on the first air outlet.

[0016] Optionally, the busbar chamber is located above the cable chamber, and the busbar chamber is isolated from the cable chamber by a third partition plate, the upper contact group is fixed on the first partition plate, and a heat dissipation gap is formed between the bottom of the upper contact group and the third partition plate;

[0017] The second air supply pipe is fixed on the first partition plate at the heat dissipation gap at the bottom of the upper contact group and is horizontally arranged along the width direction of the cabinet body, and the second air outlet is formed along the length direction of the second air supply pipe and has an air outlet direction parallel to the bottom of the upper contact group, and a second grid hole plate is arranged on the second air outlet.

[0018] Optionally, the first air cooling assembly further comprises a first flow guide vertical pipe, the first flow guide vertical pipe is located adjacent to the first partition plate in the circuit breaker chamber and is fixed on the inner side wall of the cabinet body, the bottom end of the first flow guide vertical pipe is connected to the first air supply pipe, the top end of the first flow guide vertical pipe is connected to the second air supply pipe, and the two ends of the first air supply pipe are connected to the second air supply pipe through one of the first flow guide vertical pipes.

[0019] Optionally, the top of the lower contact group is adjacent to the third partition plate, a third air outlet is formed on the side wall adjacent to the first air inlet of the first air supply pipe, the third air outlet penetrates through the first partition plate and communicates with the cable chamber, has an air outlet direction parallel to the bottom of the lower contact group, and a third grid hole plate is arranged on the third air outlet.

[0020] Optionally, the upper contact group comprises three-phase upper static contacts, the lower contact group comprises three-phase lower static contacts, the three-phase upper static contacts are electrically connected to the three-phase lower static contacts, a current transformer is arranged on the bottom side in the cable chamber, and three-phase cable connectors are fixed on the side wall of the cabinet body, the three-phase lower static contacts are electrically connected to the three-phase cable connectors, the three-phase cable connectors are used for external connection of outgoing cables, and the current transformer is sleeved on a flow guide bar used for connection of the three-phase lower static contacts and the three-phase cable connectors.

[0021] The first air cooling assembly further comprises a third air supply pipe and a second flow guide vertical pipe, the third air supply pipe is fixed on the first partition plate at the bottom in the cable chamber and is horizontally arranged along the width direction of the cabinet body, a fourth air outlet is formed along the length direction of the third air supply pipe, the fourth air outlet has an air outlet direction parallel to the bottom surface in the cable chamber, and a fourth grid hole plate is arranged on the fourth air outlet.

[0022] The second flow guide vertical pipe is located adjacent to the first partition plate in the circuit breaker chamber and is fixed to the inner side wall of the cabinet body, the top end of the second flow guide vertical pipe is connected and communicated with the first air supply pipe, the bottom end of the second flow guide vertical pipe is connected and communicated with the third air supply pipe, and the two ends of the first air supply pipe are respectively communicated with the third air supply pipe through one of the second flow guide vertical pipes.

[0023] Optionally, the third partition plate comprises a horizontally arranged first plate body and a vertically arranged second plate body, the first plate body and the second plate body are connected to form an L-shaped structure with an opening facing the first partition plate, the first plate body is fixed vertically to the first partition plate, and the first partition plate, the first plate body and the second plate body enclose the busbar chamber and form a top space of the cable chamber between the second plate body and the rear cabinet wall of the cabinet body.

[0024] The second air cooling assembly further comprises a fourth fan, which is arranged at the top of the cable chamber and cooperates with the fourth air outlet to form forced convection in the cable chamber.

[0025] Optionally, the front cabinet wall of the cabinet body is provided with a first switch cabinet door corresponding to the circuit breaker chamber and a second switch cabinet door corresponding to the front lower chamber, and the air inlet grid hole is arranged on the front cabinet wall between the first switch cabinet door and the second switch cabinet door.

[0026] The first air cooling assembly further comprises an auxiliary air inlet cover arranged in the front lower chamber and a fifth fan, the auxiliary air inlet cover is provided with a second air inlet opening vertically downward to the bottom surface of the front lower chamber, the fifth fan is fixed to the second air inlet opening, the cover body of the auxiliary air inlet cover is gradually narrowed in cross section vertically upward from the second air inlet opening, and the top end of the auxiliary air inlet cover is connected to the air outlet side of the first fan and communicates with the fan cover.

[0027] The second switch cabinet door is provided with a plurality of air inlet holes, and a downward-opening isolation cover is arranged on the second switch cabinet door at the top edge of each air inlet hole.

[0028] The application also provides a heat dissipation method, which uses the above-mentioned current switch cabinet based on double-path forced air cooling, and comprises the following steps:

[0029] Real-time monitoring and acquisition of a first temperature in the circuit breaker chamber and a second temperature in the busbar chamber are performed.

[0030] When the first temperature and / or the second temperature exceeds a preset first threshold value, the first fan is started to generate a main cooling air flow and direct the air flow to blow and clean the circuit breaker chamber and the busbar chamber.

[0031] continuously monitor a first temperature in the circuit breaker chamber and a second temperature in the busbar chamber, and set a second threshold value for the temperature being lower than the first threshold value;

[0032] when the first temperature exceeds the second threshold value, start the second fan to send air into the circuit breaker chamber and perform forced convection heat dissipation with the main cooling air flow in the circuit breaker chamber;

[0033] and / or when the second temperature exceeds the second threshold value, start the third fan to send air into the busbar chamber and perform forced convection heat dissipation with the main cooling air flow in the busbar chamber.

[0034] Compared with the prior art, the current switch cabinet and the collaborative heat dissipation method based on double-path forced air cooling provided by the embodiment of the present application have the following beneficial effects:

[0035] The main cooling air flow generated by the first fan in the fan cover is simultaneously split into the first air supply pipe and the second air supply pipe, and the first air outlet is used to directly blow away the high-temperature area by avoiding the blocking area of the circuit breaker bottom plate and directing towards the lower contact interface, thereby solving the air outlet blocking problem and achieving precise cooling of the high-temperature area. At the same time, the second air outlet is used to direct the bottom of the upper contact group to supplement low-temperature cold air, thereby effectively improving the negative pressure state of the busbar chamber and enhancing the air flowability of the area. Based on this, the second fan and the third fan are additionally arranged to send air into the cabinet and are respectively coordinated with the cooling air flow from the first air outlet and the second air outlet to form an efficient and controllable forced convection circulation in the circuit breaker chamber and the busbar chamber. The double-path air supply and the air inlet structure coordinated with the top fan significantly enhance the gas exchange rate inside and outside the cabinet, improve the overall heat dissipation efficiency, and ensure that the temperature rise of the key areas inside the switch cabinet is effectively controlled. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0037] Figure 1 A structural schematic diagram of the overall compartment layout of the current switch cabinet provided by the present application;

[0038] Figure 2 A structural schematic diagram of the assembly of each partition plate in the current switch cabinet provided by the present application;

[0039] Figure 3 A structural schematic diagram of the first air cooling assembly provided by the present application;

[0040] Figure 4 This is a schematic diagram of the internal structure of the first air-cooled component provided by the present invention;

[0041] Figure 5 A structural schematic diagram showing the installation positions of the first and second switch cabinet doors provided by the present invention;

[0042] Figure 6 for Figure 2 Enlarged schematic diagram of structure A in the middle;

[0043] Figure 7 for Figure 1 Enlarged schematic diagram of the B-structure;

[0044] Figure 8 for Figure 1 An enlarged schematic diagram of the C-structure.

[0045] The markings in the attached diagram are as follows:

[0046] 1. Cabinet; 11. Front Lower Chamber; 12. Circuit Breaker Chamber; 13. Busbar Chamber; 131. Upper Contact Assembly; 14. Cable Chamber; 141. Lower Contact Assembly; 1411. Lower Contact Interface; 15. Air Inlet Grille; 16. First Switchgear Door; 17. Second Switchgear Door; 171. Air Inlet; 172. Isolation Cover; 2. First Air-Cooling Assembly; 21. Fan Cover; 211. Expanded Diameter Air Inlet Section; 212. Expansion Chamber; 213. Reduced Diameter Air Outlet Section; 214. First Guide Plate; 215. Second Guide Plate; 22. First Fan; 23. 231. First air supply duct; 232. First perforated grid plate; 233. Third perforated grid plate; 24. Second air supply duct; 241. Second perforated grid plate; 25. First guide riser; 26. Third air supply duct; 261. Fourth perforated grid plate; 27. Second guide riser; 28. Auxiliary air inlet hood; 29. ​​Fifth fan; 3. Second air-cooling assembly; 31. Second fan; 32. Third fan; 33. Fourth fan; 4. First partition plate; 5. Second partition plate; 6. Third partition plate; 61. First plate body; 62. Second plate body; 7. Cable connector. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0048] The following detailed description of embodiments of the application in the drawings provided is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the application.

[0049] It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0050] In the description of embodiments of the application, it should be noted that if the terms "upper", "lower", "horizontal", "inner" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the application is used, only for the convenience of describing the application and simplifying the description, and it is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0051] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0052] In the description of embodiments of the application, it should also be noted that unless otherwise explicitly specified and limited, if the terms "arrangement", "installation", "connection", "connection" appear, they should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances. The preferred embodiments of the application will be described in detail in conjunction with the drawings.

[0053] The application provides a current switch cabinet based on double-path forced air cooling, as shown in Figures 1-5 The cabinet body 1 includes a first air cooling assembly 2 and a second air cooling assembly 3.

[0054] The cabinet body 1 includes a front lower chamber 11, a circuit breaker chamber 12, a busbar chamber 13 and a cable chamber 14 arranged inside the cabinet body 1. The busbar chamber 13 is provided with an upper contact group 131, and the cable chamber 14 is provided with a lower contact group 141. The lower contact group 141 is located in the circuit breaker chamber 12 and forms a lower contact interface 1411.

[0055] The first air cooling assembly 2 comprises a fan cover 21, a first fan 22, a first air supply pipe 23 and a second air supply pipe 24. The fan cover 21 is fixedly arranged in the front lower chamber 11. The cabinet 1 is provided with an air inlet grid hole 15 communicating with the front lower chamber 11. The fan cover 21 is provided with a first air inlet close to the air inlet grid hole 15. The first fan 22 is fixedly arranged in the fan cover 21. The first air supply pipe 23 communicates the air outlet side of the first fan 22 with the circuit breaker chamber 12 (see Figure 6 ), and forms a first air outlet in the circuit breaker chamber 12. The first air outlet avoids the chassis shielding area when the circuit breaker works and faces the lower contact interface 1411. The second air supply pipe 24 communicates the air outlet side of the first fan 22 with the busbar chamber 13, and forms a second air outlet in the busbar chamber 13. The second air outlet faces the bottom of the upper contact group 131 (see Figure 7 ).

[0056] The second air cooling assembly 3 comprises a second fan 31 and a third fan 32. The second fan 31 is arranged at the top of the circuit breaker chamber 12 and cooperates with the first air outlet to form forced convection in the circuit breaker chamber 12. The third fan 32 is arranged at the top of the busbar chamber 13 and cooperates with the second air outlet to form forced convection in the busbar chamber 13.

[0057] Through the implementation of the above-mentioned current switch cabinet embodiment, first, unlike the structure of the traditional switch cabinet, the lower contact group 141 is arranged in the cable chamber 14, which can effectively reduce the number of main heat sources in the circuit breaker chamber 12, and reduce the heat intensity of this area from the root, creating favorable conditions for the efficient operation of the subsequent heat dissipation system. On this basis, the first air cooling assembly 2 arranged in the front lower chamber 11 fully utilizes the redundant space in the cabinet. The fan cover 21 is close to the air inlet grid hole 15, which can directly introduce low-temperature cold air from outside the cabinet as a cooling medium through the first air inlet, effectively avoiding the negative pressure state formed in the front lower chamber 11, and ensuring the low-temperature quality and sufficient supply of the air source.

[0058] The main cooling airflow generated by the first fan 22 is precisely split into two independent directional cooling paths through the first air supply pipe 23 and the second air supply pipe 24. The first air outlet of the first air supply pipe 23 is cleverly designed to avoid the blocking area of the circuit breaker chassis and precisely aims at the lower contact interface 1411, which solves the problem of sudden reduction of effective air outlet area and airflow organization disorder caused by the chassis blocking in the traditional scheme, thereby realizing efficient and direct cooling of the core heating point of the circuit breaker chamber 12 and significantly improving the heat exchange rate of this area. At the same time, the second air outlet of the second air supply pipe 24 directly aims at the bottom of the upper contact group 131 to continuously deliver low-temperature cold air, which provides a stable low-temperature air source for the bus chamber 13 and directly exchanges heat with the heating upper contact group 131, effectively improving the negative pressure condition caused by insufficient air supply in the chamber and significantly enhancing the air flow in the chamber, thereby laying a good foundation for the overall heat dissipation of the bus chamber 13.

[0059] In addition, by starting the second fan 31 arranged at the top of the circuit breaker chamber 12 and the third fan 32 arranged at the top of the bus chamber 13, and making them work in the way of supplying air into the cabinet, two cooling airflows from the bottom are coordinated to build a forced convection circulation with clear direction and controllable flow line in the two key compartments. This double-path forced air cooling system composed of bottom directional air supply and top coordinated air supply greatly enhances the exchange intensity and rate of cold and hot air inside and outside the cabinet, so that heat can be quickly taken away from the heating body and discharged outside the cabinet, realizing precise regulation of the internal temperature of the switch cabinet.

[0060] The layout and installation of the entire air cooling assembly are optimized, all components are reasonably embedded in the existing structure of the switch cabinet, especially the available space of the front lower chamber 11 is utilized without interfering with the normal operation of other electrical elements, and the physical structure design ensures a sufficient safety distance from the live parts. The first air supply pipe 23 and the second air supply pipe 24 can be made of excellent conductors such as aluminum-zinc plates and installed closely to the partition, further ensuring that the entire device has no adverse effect on the electrical insulation level of the switch cabinet. By increasing the power of the first fan 22, the pressure gradient between the circuit breaker chamber 12 and the bus chamber 13 can be increased to optimize the air flow path and make it easier to remove heat from the contact box. Therefore, the integrated structure realizes efficient, precise and reliable control of the temperature rise in the key area of the switch cabinet in a limited space, significantly improving the reliability and service life of the equipment during long-term operation. Preferably, the air cooling assembly of the embodiment of the present application can be installed in different positions according to the size of the chassis of different types of circuit breakers, and the number of air supply pipes can be flexibly adjusted according to the rated current of the cabinet 1, showing good adaptability.

[0061] Further, as shown in FIG. 1, the air cooling assembly of the embodiment of the present application is arranged in the front lower chamber 11 of the cabinet 1, and the first fan 22 is arranged in the front lower chamber 11. Figure 4The fan cover 21 is internally formed with an airflow passage, and the airflow passage is sequentially formed with a diameter-expanded air inlet section 211, an expansion chamber 212, and a diameter-reduced air outlet section 213 along the air flow direction, the diameter-expanded air inlet section 211 is formed with a horizontally-oriented first air inlet, and the first fan 22 is fixedly arranged in the expansion chamber 212;

[0062] The fan cover 21 includes a first flow guide plate 214 that is obliquely downwardly arranged between the diameter-expanded air inlet section 211 and the expansion chamber 212, and a second flow guide plate 215 that is obliquely upwardly arranged between the expansion chamber 212 and the diameter-reduced air outlet section 213, the first air supply pipe 23 and the second air supply pipe 24 are both in communication with the end of the diameter-reduced air outlet section 213.

[0063] Through the implementation of the above-mentioned current switch cabinet embodiment, the diameter-expanded air inlet section 211 is adopted in the fan cover 21, which can effectively reduce the flow rate of the incoming airflow and expand the air inlet area, so that the external cold air can more smoothly enter the airflow passage. The expansion chamber 212 provides an optimized operating environment for the first fan 22, and the expanded internal space helps to stabilize the flow field and reduce the airflow noise during the operation of the fan. The diameter-reduced air outlet section 213 significantly improves the airflow speed delivered to the first air supply pipe 23 and the second air supply pipe 24 by accelerating the airflow, thereby enhancing the penetration ability of the cooling airflow. The first flow guide plate 214 realizes smooth transition of the airflow from the diameter-expanded air inlet section 211 to the expansion chamber 212 through the obliquely downwardly arranged design, effectively guiding the airflow to flow to the air inlet area of the first fan 22; the second flow guide plate 215 adopts the obliquely upwardly arranged design, ensuring that the airflow is smoothly guided from the expansion chamber 212 to the diameter-reduced air outlet section 213, and minimizing airflow separation and energy loss. The airflow passage precisely designed in this way cooperates with the two flow guide plates to significantly improve the working efficiency of the first fan 22, making the airflow distribution more uniform and stable. Preferably, the airflow passage structure can be made of an aluminum-zinc clad plate, which can ensure sufficient structural strength and corrosion resistance. The entire airflow passage design is compact and reasonable, and is completely integrated inside the fan cover 21, without occupying additional space, ensuring that the heat dissipation system realizes optimal performance in a limited space, while maintaining the normal air pressure balance of the front lower chamber 11, thereby providing reliable protection for the continuous and stable operation of the switch cabinet.

[0064] Further, referring back to Figure 1 , Figure 2 and Figure 6 , the circuit breaker chamber 12 and the front lower chamber 11 are isolated from the busbar chamber 13 and the cable chamber 14 by the vertically arranged first partition plate 4, the lower contact group 141 is fixedly arranged on the first partition plate 4 and forms a lower contact interface 1411 on the first partition plate 4, the circuit breaker chamber 12 is located above the front lower chamber 11, and the circuit breaker chamber 12 is isolated from the front lower chamber 11 by the horizontally arranged second partition plate 5, and the fan cover 21 includes a top cover plate that is fixedly arranged on the bottom surface of the second partition plate 5;

[0065] The first air supply pipe 23 is integrally communicated with the top cover plate and is fixed on the second partition plate 5. The first air supply pipe 23 is located in the breaker chamber 12 close to the first partition plate 4 and is horizontally arranged along the width direction of the cabinet 1. The first air outlet is opened along the length direction of the first air supply pipe 23, and the air outlet direction is vertically upward. The first air outlet is provided with the first grid hole plate 231.

[0066] Through the implementation of the above-mentioned current switch cabinet embodiment, the vertically arranged first partition plate 4 can physically isolate the breaker chamber 12, the front lower chamber 11 and the busbar chamber 13, the cable chamber 14, so as to clearly define the boundaries of each functional area, and can block the horizontal transmission of heat. In addition, the first partition plate 4 provides support for the lower contact group 141, and the lower contact group 141 can be fixed on the side of the first partition plate 4 facing the cable chamber 14, and the lower contact interface 1411 is formed on the side of the first partition plate 4 facing the breaker chamber 12. The main heat source (the lower contact group 141) is isolated in the cable chamber 14 to reduce the initial heat load in the breaker chamber 12, and the necessary electrical connection can be realized in the breaker chamber 12 through the lower contact interface 1411.

[0067] As described above, the horizontally arranged second partition plate 5 effectively separates the breaker chamber 12 from the front lower chamber 11, which can effectively prevent the mutual interference of heat on the vertical direction, and the second partition plate 5 provides a support basis for the installation of the fan cover 21. The top cover plate of the fan cover 21 is fixedly arranged on the bottom surface of the second partition plate 5, which can form a compact integrated structure to ensure that the space in the front lower chamber 11 is fully utilized and improve the stability of the fixation of the fan cover 21. In addition, the integrated communication of the first air supply pipe 23 and the top cover plate can make the cooling airflow directly enter the first air supply pipe 23 from the fan cover 21 through the top cover plate to form a high-efficiency short-path air supply channel, thereby enabling rapid air cooling of the environment in the breaker chamber 12.

[0068] Since the first partition plate 4 is located at the last side in the breaker chamber 12, the first air supply pipe 23 is arranged close to the first partition plate 4, so that the first air supply pipe 23 is also located at the last side in the breaker chamber 12. Thus, the first air outlet can completely avoid all moving parts in the working and moving range of the breaker bottom disc car in the breaker chamber 12. That is, it is ensured that no matter whether the breaker is in the working position or the removed position, the first air outlet will not be blocked by any part, and the air outlet is always smooth. Based on this, the first air outlet is opened along the length direction of the first air supply pipe 23, and the air outlet direction is vertically upward, so that the cooling airflow can directly act on the main heat source area such as the lower contact interface 1411 with the shortest path, effectively eliminating the airflow short circuit and heat dissipation dead angle problem caused by improper position of the air outlet in the breaker chamber 12.

[0069] Meanwhile, the first grid hole plate 231 on the first air outlet is used to accelerate the cooling airflow when it passes through the grid hole, so as to further increase the speed of the outlet airflow. Once the cooling airflow speed in the circuit breaker chamber 12 is increased, the heat exchange coefficient of the cooling airflow flowing through the heat generating body surface can be increased, so as to significantly improve the heat exchange efficiency and take away more heat in the circuit breaker chamber 12, thereby improving the heat dissipation effect. Preferably, the first air supply pipe 23 is made of aluminum-zinc plate, which can ensure the structural strength and has good corrosion resistance.

[0070] Further, referring back to Figure 1 、 Figure 2 and Figure 7 , the busbar chamber 13 is located above the cable chamber 14, and the busbar chamber 13 and the cable chamber 14 are isolated by the third partition plate 6. The upper contact group 131 is fixedly arranged on the first partition plate 4, and the bottom of the upper contact group 131 and the third partition plate 6 have a heat dissipation gap.

[0071] The second air supply pipe 24 is fixedly arranged on the first partition plate 4 at the heat dissipation gap at the bottom of the upper contact group 131, and is arranged horizontally along the width direction of the cabinet 1. The second air outlet is arranged along the length direction of the second air supply pipe 24, and the air outlet direction is parallel to the bottom of the upper contact group 131. The second air outlet is provided with a second grid hole plate 241.

[0072] Further, as shown in Figure 3 , the first air cooling assembly 2 further comprises a first flow guide vertical pipe 25. The first flow guide vertical pipe 25 is arranged in the circuit breaker chamber 12 close to the first partition plate 4 and is fixedly arranged on the inner side wall of the cabinet 1. The bottom end of the first flow guide vertical pipe 25 is connected to the first air supply pipe 23, and the top end of the first flow guide vertical pipe 25 is connected to the second air supply pipe 24. The two ends of the first air supply pipe 23 are respectively connected to the second air supply pipe 24 through a first flow guide vertical pipe 25.

[0073] Through the implementation of the above-mentioned current switch cabinet embodiment, the bus chamber 13 and the cable chamber 14 are physically isolated by the third partition plate 6, which can effectively prevent the mutual interference of heat on the vertical direction. The upper contact group 131 is adjacent to the third partition plate 6 to form a heat dissipation gap that limits the air flow passage section, which on the one hand provides a directional heat dissipation channel for the key heat generating area (the upper contact group 131), and on the other hand builds a controlled air flow buffer zone, which realizes the acceleration of cooling air flow by limiting the air flow passage section, and ensures that the cooling air flow can pass through the bottom of the upper contact group 131. Therefore, the second air supply pipe 24 is fixedly arranged on the first partition plate 4 and located at the heat dissipation gap, which is horizontally arranged along the width direction of the cabinet body 1, and cooperates with the air flow acceleration effect of the second grid hole plate 241 to form a continuous and stable air supply plane, so that the cooling air flow can act on the bottom of the upper contact group 131 with the smallest flow resistance and the largest contact area, thereby quickly taking away the heat of the upper contact group 131. In addition, the second air supply pipe 24 continuously supplies fresh air to the bus chamber 13 for continuous heat dissipation of the entire bus chamber 13.

[0074] As described above, the first flow guide vertical pipe 25 is used to establish efficient air flow transportation between the first air supply pipe 23 and the second air supply pipe 24, and the two first flow guide vertical pipes 25 are distributed relatively to ensure the pressure balance distribution of the cooling air flow during transportation. That is, after the cooling air flow is output from the fan cover 21, it first enters the first air supply pipe 23 in its entirety, and since the first air supply pipe 23 directly supplies air to the circuit breaker chamber 12. At the same time, part of the cooling air flow rises through the first flow guide vertical pipe 25 into the second air supply pipe 24 to be transported to the bus chamber 13 for heat dissipation of the bus chamber 13.

[0075] As described above, based on the air supply path between the first air supply pipe 23 and the second air supply pipe 24, since the cooling air flow directly enters the first air supply pipe 23 from the fan cover 21 through the top cover plate, the cooling air flow can first enter the circuit breaker chamber 12 for rapid air cooling with the shortest path. At this time, the bus chamber 13 has not yet been supplemented with cooling air flow, so that a relatively high air pressure can be quickly established in the circuit breaker chamber 12. At the same time, part of the cooling air flow also needs to rise through the first flow guide vertical pipe 25 into the second air supply pipe 24 to be ultimately transported to the bus chamber 13. Due to the sequence and resistance difference of the air flow path, the circuit breaker chamber 12 always maintains a relatively high pressure level, while the bus chamber 13 is in a relatively low pressure state.

[0076] However, since the first air outlet on the first air supply pipe 23 is directly opposite the lower contact head interface 1411, when the cooling airflow is ejected vertically upward from the first air outlet at a high speed, a concentrated and high-speed airflow, i.e. a jet, is formed in the area of the lower contact head interface 1411. According to Bernoulli's principle, the greater the fluid speed, the lower the static pressure, so that a local low-pressure area is formed around the high-speed jet. This local low-pressure area just covers the area of the lower contact head interface 1411. Although the overall air pressure in the circuit breaker chamber 12 is higher than that in the busbar chamber 13 due to the continuous air supply, at this position, the local pressure caused by the high-speed jet is even lower than that in the busbar chamber 13. It is this local pressure difference that can drive the cooling airflow in the busbar chamber 13 to be "sucked" through the inlet of the upper contact head group 131 (the upper contact head group 131 is usually installed in a contact box made of insulating material, which is communicated with the busbar chamber 13 through the inlet and has an opening on the side of the circuit breaker chamber 12 so that the movable contact of the circuit breaker can be inserted), and merged into the high-pressure cooling airflow in the circuit breaker chamber 12, and quickly taken away. Thus, the cooling airflow in the busbar chamber 13 can actively penetrate the internal structure of the upper contact head group 131 to take away the heat deep inside, greatly improving the heat dissipation efficiency in the busbar chamber 13. At the same time, the cooling airflow supplied by the second air supply pipe 24 to the busbar chamber 13 directly cools the bottom of the upper contact head group 131, and also compensates for the pressure loss that may be caused by the part of the airflow being taken away, ensuring that the busbar chamber 13 maintains a slight positive pressure to prevent dust from entering.

[0077] Therefore, the embodiment of the present application combines the airflow distribution structure of the first air supply pipe 23 and the second air supply pipe 24, and the layout of the chambers in the cabinet 1, uses the pressure difference to drive the internal air circulation that is conducive to deep heat dissipation, and at the same time realizes surface cooling and pressure balance through subsequent directional air supply, so that a series of structural and spatial layout synergies together form an efficient, reliable and self-adaptive heat dissipation system.

[0078] Further, in combination with Figure 3 and Figure 8 As shown, the top of the lower contact head group 141 is adjacent to the third partition plate 6, the first air supply pipe 23 is adjacent to the first air inlet, and the third air outlet is provided on the side wall of the first air supply pipe 23, the third air outlet penetrates the first partition plate 4 and communicates with the cable chamber 14, the air outlet direction of the third air outlet is parallel to the bottom of the lower contact head group 141, and the third air outlet is provided with a third grid hole plate 232.

[0079] Through the implementation of the above-mentioned current switch cabinet embodiment, the third air outlet is opened in the side wall of the first air supply pipe 23 and directly communicates with the cable chamber 14, so that the main cooling airflow generated by the first fan 22 is further reasonably distributed: part of the airflow blows vertically upward to the contact interface, and the other part blows horizontally to the bottom of the lower contact group 141 through the third air outlet. This common pipe distribution fully utilizes the energy of the airflow, realizes the "one pipe two use" high-efficiency heat dissipation mode. The third air outlet is parallel to the air outlet direction of the bottom of the lower contact group 141, which can ensure that the cooling airflow can fully cover the heating area, and the third grid hole plate 232 enhances the heat exchange effect by increasing the airflow speed. The cable chamber 14 can obtain a continuous and stable cooling airflow, which not only ensures the heat dissipation effect of the lower contact group 141, but also maintains the pressure balance of the cable chamber 14 through airflow supplement to prevent the temperature rise from exceeding the standard due to heat accumulation. Through the optimization of airflow organization and space layout, the system realizes the optimization of heat dissipation performance in a limited space, and provides comprehensive and reliable heat dissipation protection for the large-current switch cabinet.

[0080] Further, referring back to Figure 2 、 Figure 3 and Figure 8 , the upper contact group 131 includes three-phase upper static contacts, the lower contact group 141 includes three-phase lower static contacts, and the three-phase upper static contacts are electrically connected with the three-phase lower static contacts. The bottom side in the cable chamber 14 is further provided with a current transformer, and the three-phase cable joint 7 is fixed on the side wall of the cabinet 1, the three-phase lower static contacts are electrically connected with the three-phase cable joint 7, and the three-phase cable joint 7 is used for external connection of outgoing cables, and the current transformer is sleeved on the current-carrying bar for connecting the three-phase lower static contacts and the three-phase cable joint 7;

[0081] The first air cooling assembly 2 further includes a third air supply pipe 26 and a second flow guide vertical pipe 27. The third air supply pipe 26 is fixed on the first partition plate 4 at the bottom of the cable chamber 14 and is horizontally arranged along the width direction of the cabinet 1. The third air supply pipe 26 is provided with a fourth air outlet in the length direction, the air outlet direction of the fourth air outlet is parallel to the bottom surface of the cable chamber 14, and the fourth air outlet is provided with a fourth grid hole plate 261;

[0082] The second flow guide vertical pipe 27 is located in the circuit breaker chamber 12 close to the first partition plate 4 and is fixed on the inner side wall of the cabinet 1. The top end of the second flow guide vertical pipe 27 is connected and communicated with the first air supply pipe 23, and the bottom end of the second flow guide vertical pipe 27 is connected and communicated with the third air supply pipe 26. The two ends of the first air supply pipe 23 are respectively connected with the third air supply pipe 26 through a second flow guide vertical pipe 27.

[0083] Through the implementation of the above-mentioned current switch cabinet embodiment, the third air supply pipe 26 is fixedly arranged on the first partition plate 4 at the bottom of the cable chamber 14, so as to efficiently utilize the space at the bottom of the cable chamber 14. The horizontal arrangement of the third air supply pipe 26 along the width direction of the cabinet body 1 can ensure that the cooling airflow can fully cover the transverse area of the cable chamber 14, and the fourth air outlet opened on the third air supply pipe 26 along the length direction has an air outlet direction parallel to the bottom surface of the cable chamber 14, so that the cooling airflow can flow close to the bottom surface of the cable chamber 14 to form a cooling air curtain covering the entire bottom of the cable chamber 14. In addition, the arrangement of the fourth grid hole plate 261 can significantly increase the airflow speed of the air outlet, so as to enhance the penetration ability of the airflow to the equipment at the bottom of the cable chamber 14, and ensure the uniformity of the airflow distribution through the flow equalization effect.

[0084] As described above, the second flow guide vertical pipe 27 is used to construct a complete airflow channel from the first air supply pipe 23 to the third air supply pipe 26. The symmetrical arrangement of the two second flow guide vertical pipes 27 ensures the uniformity of airflow distribution and avoids the airflow unevenness problem caused by unilateral air supply. This structure enables the cooling airflow in the first air supply pipe 23 to be smoothly delivered to the cable chamber 14 through the second flow guide vertical pipe 27, so as to provide targeted cooling for the connection area of the current transformer, the three-phase lower static contact and the three-phase cable joint 7. In particular, the air outlet direction of the fourth air outlet is parallel to the bottom surface of the cable chamber 14, which is beneficial to the cooling airflow directly acting on the surface of the current transformer sleeved on the flow guide row and the connection part of the three-phase lower static contact and the three-phase cable joint 7. These parts become the main heat sources in the cable chamber 14 due to passing through large current.

[0085] Preferably, the third air supply pipe 26 can be made of an aluminum-zinc sheet, which has good corrosion resistance while ensuring structural strength, and through the close-fitting installation of the third air supply pipe 26 and the first partition plate 4, reliable electrical insulation performance is ensured. The above-mentioned three-dimensional heat dissipation structure not only effectively reduces the temperature rise of the current transformer and the connection flow guide row, but also maintains the pressure balance of the cable chamber 14 through continuous cooling airflow supplement, preventing dust accumulation and local overheating. Among them, the direct reduction of the working temperature of the current transformer as the key measuring equipment helps to improve the measurement accuracy and prolong the service life. The effective cooling of the connection point of the three-phase cable joint 7 significantly improves the reliability of the cable connection part and reduces the potential failure risk caused by contact resistance heating. Therefore, the embodiment of the present application maximizes the heat dissipation performance in the limited space of the cable chamber 14 through scientific airflow path planning and space layout optimization, and provides complete technical support for the overall thermal management of the large current switch cabinet.

[0086] In addition, due to the third air outlet adjacent to the third partition plate 6 for horizontal air supply, and the fourth air outlet located at the bottom of the cable chamber 14 for horizontal air supply, the top and bottom collaborative horizontal air supply layout just forms a complete air circulation path in the cable chamber 14: after the air flow sent by the third air outlet cools the lower contact group 141, the heated air rises and meets the cooling air flow rising from the fourth air outlet, and the two air flows jointly take away the heat from the cable chamber 14. Both the synchronous cooling of the lower contact group 141 installed at a high position and the current transformer installed at a low position are ensured, and the air circulation inside the cable chamber 14 is promoted through the three-dimensional air flow organization.

[0087] Further, referring back to Figure 2 , the third partition plate 6 includes a horizontally arranged first plate body 61 and a vertically arranged second plate body 62, the first plate body 61 and the second plate body 62 are connected to form an L-shaped structure with an opening facing the first partition plate 4, the first plate body 61 is vertically fixed with the first partition plate 4, and the first partition plate 4, the first plate body 61 and the second plate body 62 enclose the bus chamber 13, and form a top space of the cable chamber 14 between the second plate body 62 and the rear cabinet wall of the cabinet 1;

[0088] The second air cooling assembly 3 further includes a fourth fan 33, which is arranged at the top of the cable chamber 14 and cooperates with the fourth air outlet to form forced convection in the cable chamber 14.

[0089] Through the implementation of the above-mentioned current switch cabinet embodiment, the third partition plate 6 adopts an L-shaped structure to accurately define the physical boundary of the bus chamber 13, and at the same time, the second plate body 62 is spaced from the rear cabinet wall of the cabinet 1 to naturally form the top space of the cable chamber 14, so as to realize efficient use of space and optimization of functional partition. In addition, the vertical fixing of the first plate body 61 and the first partition plate 4 can enhance the stability of the overall frame and provide a reliable installation basis for the heat dissipation structure. The fourth fan 33 is arranged at the top of the cable chamber 14 and works in a way of sending air into the cabinet, which forms a top-bottom response with the cooling air flow sent by the third air supply pipe 26 at the bottom of the cable chamber 14, and builds a forced convection circulation in the cable chamber 14, so that the cooling air flow can penetrate the entire space of the cable chamber 14 and effectively act on the key heating components such as the current transformer, the three-phase lower static contact and the three-phase cable joint 7.

[0090] Preferably, the delivery of the entire cooling air flow can be precisely calculated to achieve dynamic balance between the air supply amount of the fourth fan 33 and the air outlet amount of the third air supply pipe 26, so as to ensure that the internal environment of the cable chamber 14 maintains an appropriate temperature and pressure. The above-mentioned three-dimensional heat dissipation structure is beneficial to the cooling air flow to fully contact the surface of the current transformer sleeved on the flow guide row, and the connection area of the three-phase lower static contact and the three-phase cable joint 7, thereby enhancing the convective heat transfer intensity of these key parts, effectively reducing the working temperature, and improving the reliability and service life of the equipment operation.

[0091] As mentioned above, in the breaker chamber 12, busbar chamber 13 and cable chamber 14, the low-temperature air is introduced and directly blown to the heat-generating components in each compartment by the bottom air supply as the main cooling airflow. At the same time, the air in each compartment is supplied by the fan at the top of the compartment as an auxiliary cooling airflow to form a coordinated airflow field at the top of the corresponding compartment. This bottom and top simultaneous air supply mode can destroy the static flow field of the natural upward accumulation of hot air in the compartment, forcing the cold and hot air to mix and exchange intensively in the chamber to fully take away the heat at each position in the compartment. And finally, this heat-carrying airflow can be preferably discharged outside the cabinet through the pre-set pressure relief channel or exhaust port at the top of the corresponding compartment, thereby forming a complete, dynamic "cooling-heating-discharging" heat transfer closed loop.

[0092] Further, referring back to Figure 4 and Figure 5 , the front cabinet wall of the cabinet body 1 is provided with a first switch cabinet door 16 corresponding to the breaker chamber 12, and a second switch cabinet door 17 corresponding to the front lower chamber 11, and the air inlet grid hole 15 is located on the front cabinet wall between the first switch cabinet door 16 and the second switch cabinet door 17;

[0093] The first air cooling assembly 2 further comprises an auxiliary air inlet cover 28 and a fifth fan 29 arranged in the front lower chamber 11, the auxiliary air inlet cover 28 is provided with a second air inlet vertically downward to the bottom surface of the front lower chamber 11, and the fifth fan 29 is fixedly arranged on the second air inlet, the cover body of the auxiliary air inlet cover 28 is in a gradually narrowing diameter structure vertically upward from the second air inlet, and the top end of the auxiliary air inlet cover 28 is in communication with the fan cover 21 on the air outlet side of the first fan 22.

[0094] The second switch cabinet door 17 is provided with a plurality of air inlet holes 171, and a downwardly open isolation cover 172 is arranged on the second switch cabinet door 17 at the top edge of each air inlet hole 171.

[0095] Through the implementation of the above current switch cabinet embodiment, the auxiliary air inlet cover 28 and the fifth fan 29 are added in the front lower chamber 11, which can enhance the air supply capacity and reliability of the main heat dissipation structure (the first fan 22). The second air inlet vertically downward on the auxiliary air inlet cover 28, combined with the forced air extraction of the fifth fan 29, can efficiently extract the cooling air accumulated at the bottom of the front lower chamber 11, avoiding the formation of airflow dead angle in this area. At the same time, the gradually narrowing diameter structure of the auxiliary air inlet cover 28 from the second air inlet upward utilizes the Venturi effect to continuously accelerate the cooling airflow during the rising process, and finally the airflow at the top end converges with the main cooling airflow in the fan cover 21 at a high speed, so as to improve the airflow pressure and flow rate on the air outlet side of the first fan 22. Thus, a stable air source backup is provided for the main heat dissipation structure to ensure that sufficient cooling airflow can be provided.

[0096] As described above, the provision of a plurality of air inlet holes 171 on the second switch cabinet door 17 provides sufficient supplemental air inlet channels for the front lower chamber 11, ensuring that the fifth fan 29 will not cause negative pressure in the front lower chamber 11 when it is operating. The opening provided at the top edge of each air inlet hole 171 is directed downward into the isolation cover 172, forming an effective dust and water prevention structure that can prevent external dust, water droplets and other foreign matter from directly entering the front lower chamber 11 through the air inlet hole 171, thereby ensuring ventilation while improving the protection level of the switch cabinet. This allows sufficient cooling airflow to be maintained by the fifth fan 29 even when the air inlet grating holes 15 are partially blocked. This multi-layered air inlet structure enables the entire cooling system to operate stably under various working conditions, significantly improving the environmental adaptability and operational reliability of the switch cabinet. It provides a solid air source basis for the dual-path forced air cooling-based cooling system, ultimately achieving precise control of the temperature rise of the high-current switch cabinet.

[0097] The application also provides a cooperative cooling method using the above-mentioned high-current switch cabinet based on dual-path forced air cooling, comprising:

[0098] Real-time monitoring of the first temperature in the circuit breaker chamber 12 and the second temperature in the bus chamber 13;

[0099] When the first temperature and / or the second temperature exceeds the preset first threshold value, the first fan 22 is started to generate a main cooling airflow and direct it to sweep the circuit breaker chamber 12 and the bus chamber 13;

[0100] Continuously monitor the first temperature in the circuit breaker chamber 12 and the second temperature in the bus chamber 13, and set a second threshold value that is lower than the first threshold value;

[0101] When the first temperature exceeds the second threshold value, the second fan 31 is started to supply air to the circuit breaker chamber 12 and perform forced convection cooling with the main cooling airflow in the circuit breaker chamber 12;

[0102] And / or when the second temperature exceeds the second threshold value, the third fan 32 is started to supply air to the bus chamber 13 and perform forced convection cooling with the main cooling airflow in the bus chamber 13.

[0103] Through the implementation of the above-mentioned cooperative cooling method embodiment, first, the first temperature in the circuit breaker chamber 12 and the second temperature in the bus chamber 13 are monitored in real time, and an intelligent temperature control system based on real-time data is constructed. When the first temperature and / or the second temperature exceeds the preset first threshold value (e.g. 75℃), the first fan 22 is started to generate a main cooling airflow and direct it to sweep the circuit breaker chamber 12 and / or the bus chamber 13, which realizes the basic cooling function of rapid preliminary cooling, prevents temperature from continuously rising to cause equipment insulation aging or connection point loosening, and ensures effective control in the initial stage of temperature rise.

[0104] The first temperature in the circuit breaker chamber 12 and the second temperature in the busbar chamber 13 are continuously monitored, and a second threshold value (e.g. 65℃) lower than the first threshold value is set, so that the system can start the second fan 31 to send air into the circuit breaker chamber 12 if the first temperature is still higher than the second threshold value after the first fan 22 is running, or start the third fan 32 to send air into the busbar chamber 13 if the second temperature is still higher than the second threshold value, to form forced convection heat dissipation with the main cooling air flow. Thus, through the interaction of the top and bottom air flows, the air disturbance and heat exchange intensity are enhanced, the heat dissipation dead angle is effectively eliminated, and the temperature is quickly reduced to the safe range.

[0105] The above-mentioned double threshold setting creates a precise heat dissipation strategy in stages and intensity to distinguish different degrees of thermal load working conditions:

[0106] For example, in the case of mild high temperature caused by diurnal temperature difference or seasonal load fluctuation, the temperature in the switch cabinet may exceed the first threshold value for a short time, but the temperature can be quickly reduced below the second threshold value through the directional blowing of the main cooling air flow of the first fan 22, thereby avoiding the unnecessary start of the second fan 31 or the third fan 32, significantly reducing system energy consumption and fan mechanical wear, and improving operation economy and equipment life.

[0107] Under the condition of continuous high load operation in industrial environment or extreme climate, the heat accumulation speed is faster, and the first fan 22 alone may not meet the heat dissipation demand, at this time, through the cooperative start of the second fan 31 and the third fan 32, forced convection is formed with the main cooling air flow, the heat dissipation from the circuit breaker chamber 12 and the busbar chamber 13 is accelerated, local overheating points are prevented from being generated, and the stability and reliability of the electrical performance of the equipment are maintained.

[0108] In practical application, for example, when the power distribution system encounters short-term overload, the first temperature of the circuit breaker chamber 12 may quickly rise above the first threshold value, but the timely intervention of the first fan 22 can effectively control the temperature within the second threshold value through bottom air supply, without the assistance of the top fan, thereby optimizing energy use. When the second temperature in the busbar chamber 13 is continuously high due to long-term large current operation, the start of the third fan 32 can improve the uniformity and efficiency of heat dissipation through the forced convection of the top air supply and the bottom main cooling air flow, and avoid damage to the busbar caused by thermal stress.

[0109] During the entire control process, the first fan 22 provides basic cooling support, while the second fan 31 and the third fan 32 provide enhanced heat dissipation capacity when needed. This configuration ensures both heat dissipation effect and energy consumption optimization. The implementation of forced convection cooling relies on the cooperation of bottom air supply and top air supply to form a complete air circulation path in the respective chambers. The setting of double thresholds avoids frequent start-stop of the fans, prolongs the service life of the equipment, and prevents energy waste caused by excessive cooling through precise control. Real-time monitoring system ensures timely capture of temperature changes, providing accurate data support for the implementation of hierarchical heat dissipation strategy. This intelligent collaborative cooling method achieves the best balance between energy efficiency and heat dissipation effect by dynamically adjusting the cooling intensity, ensuring that the current switch cabinet operates efficiently and stably under varying conditions, while reducing maintenance costs and failure risks, significantly improving the operation reliability and service life of the equipment.

[0110] Further, the third temperature in the cable chamber 14 can also be obtained by real-time monitoring for the heat dissipation requirements of the cable chamber 14. When the third temperature exceeds the preset first threshold value, the first fan 22 is started to generate a main cooling air flow and guide directional purging of the cable chamber 14. When the third temperature exceeds the second threshold value, the fourth fan 33 is started to supply air to the cable chamber 14 and perform forced convection cooling with the main cooling air flow in the cable chamber 14. This hierarchical control strategy realizes precise temperature management of different height heating elements such as current transformers, lower contact groups 141 and cable joints 7 in the cable chamber 14 through the cooperative scheduling of top and bottom air supply in the cable chamber 14 and top fan air supply, ensuring the dynamic optimal balance of heat dissipation efficiency and energy consumption of the cable chamber 14.

[0111] The above is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A current switchgear based on dual-path forced air cooling, characterized in that: The current switch cabinet includes a cabinet body, a first air-cooling component, and a second air-cooling component. The cabinet includes an internally isolated front lower chamber, a circuit breaker chamber, a busbar chamber, and a cable chamber. An upper contact group is provided in the busbar chamber, and a lower contact group is provided in the cable chamber. The lower contact group is located in the circuit breaker chamber and forms a lower contact interface. The first air-cooled assembly includes a fan cover, a first fan, a first air supply duct, and a second air supply duct. The fan cover is fixed in the front lower chamber. An air inlet grille is provided on the cabinet, connecting to the front lower chamber. The fan cover also has a first air inlet adjacent to the air inlet grille. The first fan is fixed inside the fan cover. The first air supply duct connects the air outlet side of the first fan to the circuit breaker chamber. The first air supply duct forms a first air outlet in the circuit breaker chamber. The first air outlet avoids the chassis obstruction area when the circuit breaker is working and faces the lower contact interface. The second air supply duct connects the air outlet side of the first fan to the busbar chamber. The second air supply duct forms a second air outlet in the busbar chamber. The second air outlet faces the bottom of the upper contact group. The second air-cooled assembly includes a second fan and a third fan. The second fan is located at the top of the circuit breaker compartment and works with the first air outlet to form forced convection in the circuit breaker compartment. The third fan is located at the top of the busbar compartment and works with the second air outlet to form forced convection in the busbar compartment. An airflow channel is formed inside the fan cover, and the airflow channel sequentially forms an expanding diameter inlet section, an expanding chamber, and a constricting diameter outlet section along the airflow direction. A horizontally oriented first air inlet is formed on the expanding diameter inlet section, and the first fan is fixed in the expanding chamber. The fan cover includes a first guide plate that guides the airflow obliquely downward between the expanded diameter air inlet section and the expansion chamber, and a second guide plate that guides the airflow obliquely upward between the expansion chamber and the reduced diameter air outlet section. Both the first air supply pipe and the second air supply pipe are connected to the end of the reduced diameter air outlet section. The circuit breaker compartment and the lower front compartment are isolated from the busbar compartment and the cable compartment by a vertically arranged first partition plate. The lower contact assembly is fixed on the first partition plate and forms the lower contact interface on the first partition plate. The circuit breaker compartment is located above the lower front compartment, and the circuit breaker compartment and the lower front compartment are isolated from each other by a horizontally arranged second partition plate. The fan cover includes a top cover plate that is attached to and fixed to the bottom surface of the second partition plate. The first air supply duct is integrally connected to the top cover plate and fixed on the second partition plate. The first air supply duct is located in the circuit breaker room adjacent to the first partition plate and is horizontally arranged along the width direction of the cabinet. The first air outlet is opened along the length direction of the first air supply duct, and its air outlet direction is vertically upward. A first grid perforated plate is provided on the first air outlet.

2. A current switchgear based on dual-path forced air cooling according to claim 1, characterized in that: The busbar compartment is located above the cable compartment, and the busbar compartment and the cable compartment are isolated by a third partition plate. The upper contact assembly is fixed on the first partition plate, and there is a heat dissipation gap between the bottom of the upper contact assembly and the third partition plate. The second air supply duct is fixed to the first partition plate at the heat dissipation gap at the bottom of the upper contact group and is arranged horizontally along the width direction of the cabinet. The second air outlet is opened along the length direction of the second air supply duct, and its air outlet direction is parallel to the bottom of the upper contact group. A second grid perforated plate is provided on the second air outlet.

3. A current switch cabinet based on dual-path forced air cooling according to claim 2, characterized in that: The first air-cooled assembly also includes a first air guide riser. The first air guide riser is located in the circuit breaker room adjacent to the first partition plate and is fixed on the inner side wall of the cabinet. The bottom end of the first air guide riser is connected to the first air supply pipe, and the top end of the first air guide riser is connected to the second air supply pipe. Both ends of the first air supply pipe are connected to the second air supply pipe through a first air guide riser.

4. A current switchgear based on dual-path forced air cooling according to claim 3, characterized in that: The top of the lower contact assembly is adjacent to the third partition plate. A third air outlet is provided on the side wall adjacent to the first air inlet of the first air supply pipe. The third air outlet passes through the first partition plate and connects to the cable chamber. Its air outlet direction is parallel to the bottom of the lower contact assembly, and a third grid plate is provided on the third air outlet.

5. A current switchgear based on dual-path forced air cooling according to claim 2, characterized in that: The upper contact group includes three-phase upper stationary contacts, and the lower contact group includes three-phase lower stationary contacts. The three-phase upper stationary contacts and the three-phase lower stationary contacts are electrically connected. A current transformer is also provided on the bottom side of the cable compartment, and a three-phase cable connector is fixed on the side wall of the cabinet. The three-phase lower stationary contacts and the three-phase cable connector are electrically connected, and the three-phase cable connector is used to connect external outgoing cables. The current transformer is sleeved on the current-conducting busbar used to connect the three-phase lower stationary contacts and the three-phase cable connector. The first air-cooling component also includes a third air supply pipe and a second guide pipe. The third air supply pipe is located at the bottom of the cable chamber and is fixed on the first partition plate. It is laid horizontally along the width direction of the cabinet. A fourth air outlet is opened on the third air supply pipe along the length direction. The air outlet of the fourth air outlet is parallel to the bottom surface of the cable chamber. A fourth grid perforated plate is provided on the fourth air outlet. The second flow guide riser is located in the circuit breaker room adjacent to the first partition plate and is fixed on the inner side wall of the cabinet. The top end of the second flow guide riser is connected to the first air supply pipe, and the bottom end of the second flow guide riser is connected to the third air supply pipe. Both ends of the first air supply pipe are connected to the third air supply pipe through a second flow guide riser.

6. A current switchgear based on dual-path forced air cooling according to claim 5, characterized in that: The third partition plate includes a horizontally arranged first plate and a vertically arranged second plate. The first plate and the second plate are connected to form an L-shaped structure with the opening facing the first partition plate. The first plate is vertically fixed to the first partition plate. The first partition plate, the first plate, and the second plate form the busbar compartment, and the top space of the cable compartment is formed between the second plate and the rear wall of the cabinet. The second air-cooling component also includes a fourth fan, which is located at the top of the cable chamber and works with the fourth air outlet to form forced convection within the cable chamber.

7. A current switchgear based on dual-path forced air cooling according to claim 1, characterized in that: The front cabinet wall of the cabinet is provided with a first switch cabinet door corresponding to the circuit breaker compartment and a second switch cabinet door corresponding to the front lower compartment. The air inlet grille is located on the front cabinet wall between the first switch cabinet door and the second switch cabinet door. The first air-cooling assembly also includes an auxiliary air inlet hood and a fifth fan disposed in the front lower chamber. The auxiliary air inlet hood is provided with a second air inlet that is vertically downward toward the bottom surface of the front lower chamber. The fifth fan is fixed on the second air inlet. The hood of the auxiliary air inlet hood has a tapered structure with a cross-section that gradually narrows from the second air inlet upward. The top of the auxiliary air inlet hood is located on the air outlet side of the first fan and communicates with the fan hood. The second switch cabinet door is provided with a number of air inlets, and an isolation cover with an opening facing downward is provided on the second switch cabinet door at the top edge of each of the air inlets.

8. A synergistic heat dissipation method, employing a current switchgear based on dual-path forced air cooling as described in any one of claims 1-7, characterized in that, The synergistic heat dissipation method includes: The first temperature inside the circuit breaker compartment and the second temperature inside the busbar compartment are monitored and acquired in real time. When the first temperature and / or the second temperature exceeds a preset first threshold, the first fan is activated to generate the main cooling airflow and guide it to directionally purge the circuit breaker compartment and the busbar compartment. The system continuously monitors and acquires the first temperature inside the circuit breaker compartment and the second temperature inside the busbar compartment, and sets a second threshold where the temperature is lower than the first threshold. When the first temperature exceeds the second threshold, the second fan is started to supply air to the circuit breaker room and to perform forced convection cooling with the main cooling airflow in the circuit breaker room; And / or when the second temperature exceeds the second threshold, the third fan is activated to supply air to the busbar room and to perform forced convection cooling with the main cooling airflow in the busbar room.

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