A high-current switch cabinet sharing a pressure relief device heat dissipation structure

Abstract

The application discloses a high-current switch cabinet heat dissipation structure sharing a pressure relief device and belongs to the technical field of switch cabinets. The high-current switch cabinet heat dissipation structure sharing a pressure relief device comprises a switch cabinet frame, a fixed partition plate arranged in the switch cabinet frame, a heat dissipation fan set, a pressure relief cover plate, a limiting hole arranged on the pressure relief cover plate, a limiting plate and a flow guide partition plate. One side of the pressure relief cover plate is easy to bend, the other side is not easy to bend, the bending part is connected with the switch cabinet frame through a rigid fastener, the rigid part is connected with the switch cabinet frame through a non-rigid fastener, one end of the flow guide partition plate is hinged to the fixed partition plate, and the other end is inserted into the limiting hole on the pressure relief cover plate. Through the application, the busbar chamber and the handcart chamber of the switch cabinet can share a set of pressure relief devices, the space utilization problem in the switch cabinet is solved, the installation of the fan no longer affects the normal work of the pressure relief device, and when an internal arc fault occurs, the pressure relief device can be quickly opened and will not cause harm to surrounding operators and other equipment.

Description

Technical Field

[0001] The invention relates to a heat dissipation structure of a large-current switch cabinet with a shared pressure relief device, belonging to the technical field of switch cabinets. Background Art

[0002] High-current switchgear is a crucial piece of equipment in industrial control and power distribution systems. During use, the heat generated by the switchgear's internal components must be dissipated promptly and effectively to ensure continuous and stable operation. Currently, the most common heat dissipation structure for high-current switchgear employs fans for forced air cooling. However, due to limited space within the switchgear, installing a fan would partially occupy the space for the original pressure relief device, causing it to malfunction.

[0003] To address this issue, fans and pressure relief devices are often combined into one. This way, when an internal arc fault occurs in the switchgear, the generated high-pressure, hot gases, along with the fan, are forced out, releasing the pressure. However, due to the weight of the fan, this design inevitably slows the opening speed of the pressure relief device. Furthermore, a thrown fan could potentially injure operators and other equipment, posing a safety hazard.

[0004] Therefore, it is necessary to design a heat dissipation structure for a high-current switchgear so that the installation of the fan does not affect the normal operation of the pressure relief device, and when an internal arc fault occurs, the pressure relief device can be opened quickly without causing harm to surrounding operators and other equipment. Summary of the Invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide a high-current switchgear heat dissipation structure with a shared pressure relief device. This structure enables the trolley room and busbar room of the switchgear to share a set of pressure relief devices, which not only solves the problem of space utilization and makes the installation of the fan no longer affect the normal operation of the pressure relief device, but also applies intelligent control technology. Through temperature sensors and electronic control devices, the present invention monitors and controls the temperature inside the switchgear and automatically adjusts the fan speed according to temperature changes, taking into account both heat dissipation efficiency and energy consumption.

[0006] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0007] A heat dissipation structure for a large current switch cabinet with a shared pressure relief device, comprising a switch cabinet frame, a fixed partition, a heat dissipation fan unit, a pressure relief cover, a limit plate, and a guide partition;

[0008] Among them, the switchgear frame is used to support and install electrical equipment;

[0009] A fixed partition is provided inside the switch cabinet frame and divides the switch cabinet frame into a busbar room and a trolley room;

[0010] A cooling fan unit is installed on each side of the switch cabinet frame. The two cooling fan units are used for ventilation and heat dissipation of the busbar room and the trolley room respectively.

[0011] The pressure relief cover plate is provided on the switch cabinet frame and is located between the two heat dissipation fan units. One side of the pressure relief cover plate is a bendable portion that is easy to bend, and the other side is a rigid portion that is not easy to bend. The bendable portion is connected to the switch cabinet frame through a rigid fastener, and the rigid portion is connected to the switch cabinet through a non-rigid fastener. At least one limiting hole is provided on the plate body of the pressure relief cover plate between the bendable portion and the rigid portion.

[0012] A limiting plate is provided on each side of the guide baffle, for limiting the turning of the guide baffle;

[0013] The guide baffle has one end hinged to the fixed baffle and the other end inserted into the limiting hole on the pressure relief cover plate, so that the pressure relief cover plate remains in a limited state.

[0014] When one side of the guide baffle is impacted by the high-pressure gas, the guide baffle swings to the other side and abuts against the limit plate on the corresponding side. The guide baffle guides the gas to the pressure relief cover. The non-rigid fasteners connected to the switch cabinet frame at the rigid part of the pressure relief cover are detached from the switch cabinet frame. The bent part on the other side of the pressure relief cover is impacted and bent by the high-pressure gas. At this time, the pressure relief cover is opened and the high-pressure gas is released from the switch cabinet frame.

[0015] As a preferred example, a row of bending holes is opened on one side of the pressure relief cover plate, the area close to the bending holes is the bending portion, and the side of the pressure relief cover plate away from the bending holes is the rigid portion. The bending portion of the pressure relief cover plate is fixed to the switch cabinet frame by rigid fasteners, and the rigid portion of the pressure relief cover plate is fixed to the switch cabinet frame by non-rigid fasteners.

[0016] As a preferred example, the rigid fasteners are steel screws, and the non-rigid fasteners are nylon screws.

[0017] As a preferred example, the two limit plates are hinged to the switch cabinet frame respectively, and the two limit plates rotate clockwise and counterclockwise respectively under the action of their own weight until they are against the switch cabinet frame.

[0018] As a preferred example, the limit plates are connected to the switch cabinet frame through hinge groups respectively, and the limit plates are integrally formed by abutting parts, connecting parts and limit parts in sequence. The limit plates are connected to the hinge group through the connecting parts, and the abutting parts are arranged to be inclined upward in the horizontal direction of the connecting parts, and the limit parts are arranged to be inclined downward in the horizontal direction of the connecting parts.

[0019] As a preferred example, at least one plug-in portion is formed on the end surface of the guide baffle plate connected to the pressure relief cover plate and protrudes outward, and the guide baffle plate is inserted into the limiting hole of the pressure relief cover plate through the plug-in portion.

[0020] As a preferred example, the plug-in portion is inserted into the limiting hole at an angle toward the rigid portion of the pressure relief cover.

[0021] As a preferred example, a temperature sensor and a controller are further installed in the switch cabinet frame, and the controller is electrically connected to the temperature sensor and the heat dissipation fan unit respectively.

[0022] The beneficial effects of the present invention are:

[0023] The present invention provides a heat dissipation structure for a large-current switch cabinet with a shared pressure relief device, which can enable the busbar room and the trolley room of the switch cabinet to share a set of pressure relief devices. This not only solves the problem of space utilization in the switch cabinet, so that the installation of the fan no longer affects the normal operation of the pressure relief device, but also can prevent the pressure relief device from opening quickly when an internal arc fault occurs without causing harm to surrounding operators and other equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structural diagram of the heat dissipation structure of the switch cabinet under normal working conditions;

[0025] Figure 2 This is a schematic diagram of the top view of the heat dissipation structure of the switch cabinet under normal working conditions;

[0026] Figure 3 For the Figure 2 Schematic diagram of the cross-sectional structure in the AA direction;

[0027] Figure 4 Schematic diagram of the three-dimensional structure of the pressure relief cover;

[0028] Figure 5 Schematic diagram of the top view of the pressure relief cover;

[0029] Figure 6 Schematic diagram of the three-dimensional structure of the guide baffle;

[0030] Figure 7 Schematic diagram of the top view of the guide baffle;

[0031] Figure 8 Schematic diagram of the enlarged structure of the limiting plate;

[0032] Figure 9 This is a three-dimensional structural diagram of the heat dissipation structure of the switch cabinet when an internal arc fault occurs in the trolley room;

[0033] Figure 10 This is a top view schematic diagram of the heat dissipation structure of the switch cabinet when an internal arc fault occurs in the trolley room;

[0034] Figure 11 For the Figure 10 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0035] Figure 12 This is a three-dimensional structural diagram of the heat dissipation structure of the switchgear when an internal arc fault occurs in the busbar compartment;

[0036] Figure 13 This is a schematic diagram of the top view of the heat dissipation structure of the switchgear when an internal arc fault occurs in the busbar compartment;

[0037] Figure 14 For the Figure 13 Schematic diagram of the cross-sectional structure in the CC direction.

[0038] In the picture:

[0039] 1. Switchgear frame; 101. Busbar room; 102. Cart room;

[0040] 2. Fix the partition;

[0041] 3. Cooling fan unit;

[0042] 4. Pressure relief cover; 401. Bending portion; 402. Rigid portion; 403. Bending hole; 404. Limiting hole;

[0043] 5. Limiting plate; 501. Abutting portion; 502. Connecting portion; 503. Limiting portion;

[0044] 6. diversion baffle; 601. plug-in part;

[0045] 7. Hinge group;

[0046] 8. Nylon screws;

[0047] 9. Steel screws. DETAILED DESCRIPTION

[0048] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0050] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or mutual communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0051] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0052] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0053] refer to Figure 1-Figure 3 An embodiment of the present invention provides a heat dissipation structure for a large current switch cabinet with a shared pressure relief device, which mainly includes a switch cabinet frame 1, a fixed partition 2, a heat dissipation fan unit 3, a pressure relief cover plate 4, a limit plate 5 and a guide partition 6.

[0054] The switchgear frame 1 is a structural framework used to support and install electrical equipment, and is used in electrical distribution systems in power systems, industrial automation, and buildings. The design and construction of the frame ensures the safe operation of electrical equipment and provides an environment that facilitates maintenance and operation.

[0055] In this embodiment, the switchgear frame 1 is made of a metal material, such as steel plate or aluminum alloy. Steel plate or aluminum alloy materials offer a sturdy structure and excellent corrosion resistance, capable of withstanding the weight of electrical equipment and various environmental conditions. The frame's appearance can be customized to meet specific requirements, such as by applying a coating or surface treatment to enhance its durability and appeal.

[0056] The following factors should be considered in the design of the switch cabinet frame 1:

[0057] Load-bearing capacity: The frame must be able to support all electrical equipment installed in it and have sufficient strength and rigidity to prevent deformation or tilting.

[0058] Space Layout: The frame should provide sufficient space to install switchgear, protection devices and wiring, as well as accommodate necessary distribution components and accessories.

[0059] Ventilation and heat dissipation: The switchgear frame 1 should be designed to have good ventilation and heat dissipation performance to ensure that the installed equipment can be effectively cooled during operation and prevent overheating.

[0060] Safety: The frame should have protective measures, such as reliable grounding and insulation, to ensure the safety of operators and equipment.

[0061] Ease of maintenance and operation: The framework should provide convenient access for maintenance and operation, such as doors that are easy to open and close, signs and indicator lights, etc.

[0062] Existing high-current switchgear heat dissipation structures typically employ fans for forced air cooling. However, due to limited space, the fan's installation occupies part of the space available for the existing pressure relief device. To address this issue, the fan and pressure relief device are often combined into one. However, the fan's weight inevitably affects the speed at which the pressure relief device opens. Furthermore, if the fan is thrown, it could harm operators and other equipment, posing a potential safety hazard. Therefore, the present invention proposes a novel high-current switchgear heat dissipation structure that addresses both space utilization and safety issues.

[0063] Specifically, such as Figure 3 As shown, a fixed partition 2 is provided within the switchgear frame 1 of the present invention. The fixed partition 2 is made of sheet metal and is disposed within the switchgear frame 1 to separate the interior of the switchgear frame 1 into a busbar compartment 101 and a trolley compartment 102. The busbar compartment 101 and the trolley compartment 102 are two important components of the power system.

[0064] The busbar compartment 101 is an equipment room within an electrical cabinet that connects and distributes the main power busbars in the power system. A power busbar is a conductive device composed of conductor bars or conduits used to transmit large amounts of electrical energy. Busbar compartment 101 connects components such as power sources, transformers, and loads, transmitting power from a generating station or substation to various load points. Busbar compartment 101 also manages the connection and disconnection of branch circuits, as well as monitoring and protecting the current and voltage in the power system.

[0065] The trolley room 102 is an equipment room within the switchgear used to control, protect, and isolate power equipment. It houses power switchgear, such as circuit breakers, disconnectors, and load switches, which control and distribute current within the power system. It may also contain other equipment, such as voltage transformers, current transformers, and protective relays. The primary function of the trolley room 102 is to quickly isolate damaged equipment in the event of a power system fault and ensure safe operation.

[0066] like Figure 1-Figure 3 As shown, two groups of cooling fan units 3 are provided, each group includes three fans, and one group of cooling fan units 3 is installed on both sides above the switch cabinet frame 1. The two cooling fan units 3 are used for ventilation and heat dissipation of the busbar room 101 and the trolley room 102 respectively.

[0067] As other implementations in the embodiments of the present invention, a temperature sensor (not shown) and a controller (not shown) are also installed in the switch cabinet frame 1. The controller is electrically connected to the temperature sensor and the heat dissipation fan unit 3 respectively. In the embodiment of the present invention, intelligent control technology is applied. Through the temperature sensor and the controller, the temperature inside the switch cabinet is monitored and controlled, and the speed of the fan is automatically adjusted according to the temperature changes, while taking into account the heat dissipation efficiency and energy consumption.

[0068] like Figure 1-Figure 3 As shown, the pressure relief cover 4 is arranged on the switch cabinet frame 1 and is located between the two cooling fan units 3. Figure 4 and Figure 5As shown, the side of the pressure relief cover plate 4 close to the top of the trolley chamber 102 is a bend portion 401 that is easy to bend, and the side close to the busbar chamber 101 is a rigid portion 402 that is not easy to bend. The bend portion 401 is connected to the switch cabinet frame 1 through a rigid fastener, and the rigid portion 402 is connected to the switch cabinet through a non-rigid fastener. At least one limiting hole 404 is opened on the plate body of the pressure relief cover plate 4 between the bend portion 401 and the rigid portion 402. Figure 4 and Figure 5 As shown, in the embodiment of the present invention, the limiting holes 404 are long strips and there are three of them.

[0069] Specifically, such as Figure 3-Figure 5 As shown, in this embodiment, the bending portion 401 that is easy to bend is realized by providing a row of bending holes 403 on one side of the pressure relief cover plate 4. The bending holes 403 are made by drilling or stamping. In this embodiment, the bending holes 403 are rectangular holes. The area close to the bending holes 403 is the bending portion 401. The setting of the bending holes 403 ensures that the bending portion 401 is easy to bend. The side of the pressure relief cover plate 4 away from the bending holes 403 is the rigid portion 402. The bending portion 401 of the pressure relief cover plate 4 is fixed to the switch cabinet frame 1 by rigid fasteners, and the rigid portion 402 of the pressure relief cover plate 4 is fixed to the switch cabinet frame 1 by non-rigid fasteners.

[0070] Specifically, the rigid fasteners are steel screws 9 and the non-rigid fasteners are nylon screws 8. Although nylon bolts and nuts have good corrosion resistance, chemical corrosion resistance and insulation properties, they are relatively brittle and are not suitable for applications that withstand high strength or high loads. Steel bolts and nuts have high strength, high wear resistance and durability, and can be used in applications that withstand high strength or high loads. The nylon material has certain elasticity and flexibility characteristics and the steel material has high strength characteristics, and the bending part 401 is combined with the rigid part 402 to ensure that the pressure relief cover plate 4 as a whole will not be separated by the impact when it is impacted by high-pressure gas.

[0071] Specifically, such as Figure 3 As shown, there are two limit plates 5, one on each side of the guide baffle 6, and the limit plates 5 are respectively arranged on both sides of the bottom of the pressure relief cover 4. The limit plates 5 are hinged to the switch cabinet frame 1 through the hinge group 7. The function of the limit plates 5 is to limit the flipping of the guide baffle 6. Figure 8 As shown, the limiting plate 5 is integrally formed of an abutting portion 501, a connecting portion 502, and a limiting portion 503. The limiting plate 5 is connected to the hinge assembly 7 via the connecting portion 502. The abutting portion 501 is arranged upwardly and tilted in the horizontal direction of the connecting portion 502, and the limiting portion 503 is arranged downwardly and tilted in the horizontal direction of the connecting portion 502. Under the action of their own weight, the two limiting plates 5 rotate clockwise and counterclockwise respectively until they abut against the switchgear frame 1.

[0072] Specifically, such as Figure 3 As shown, the bottom end of the guide partition 6 is hinged to the top end of the fixed partition 2 through a hinge assembly 7. The guide partition 6 and the fixed partition 2 form an integral partition, thereby completely separating the busbar chamber 101 from the trolley chamber 102. Figure 3 as well as Figure 6-Figure 7 As shown, the end surface of the guide baffle 6 connecting to the pressure relief cover 4 has three protruding plug-in portions 601. These plug-in portions 601 are formed from the guide baffle 6 body through sheet metal. The three plug-in portions 601 can be precisely inserted into the three limiting holes 404 on the pressure relief cover 4, maintaining the pressure relief cover 4 in a restricted state. The plug-in portions 601 are inserted into the limiting holes 404 at an angle toward one side of the rigid portion 402 of the pressure relief cover 4. This design ensures that the pressure relief cover 4 can be easily separated from the guide baffle 6, ensuring rapid pressure relief.

[0073] When one side of the guide baffle 6 is impacted by the high-pressure gas, the guide baffle 6 swings to the other side and abuts against the limit plate 5 on the corresponding side. The guide baffle 6 guides the gas to the pressure relief cover 4. The non-rigid fasteners connected to the switch cabinet frame 1 at the rigid part 402 of the pressure relief cover 4 are detached from the switch cabinet frame 1. The bending part 401 on the other side of the pressure relief cover 4 is impacted and bent by the high-pressure gas. At this time, the pressure relief cover 4 is opened, and the high-pressure gas is released from the switch cabinet frame 1.

[0074] Working principle:

[0075] like Figure 3 The figure shows a schematic diagram of the switchgear heat dissipation structure under normal operation, that is, when no arc faults occur in the busbar compartment 101 or the trolley compartment 102 within the switchgear. The cooling fan unit 3 is dissipating heat normally from the air inside the busbar compartment 101 and the trolley compartment 102, respectively. At this time, the plug-in portion 601 at the top of the guide baffle 6 is inserted into the stopper hole 404 in the middle of the pressure relief cover plate 4. Under the action of their own weight, the two stopper plates 5 rotate clockwise and counterclockwise, respectively, until they abut against the switchgear frame 1. The rigid portion 402 of the pressure relief cover plate 4 is connected to the switchgear frame 1 via nylon screws 8, and the bent portion 401 of the pressure relief cover plate 4 is connected to the switchgear frame 1 via steel screws 9. The pressure relief cover plate 4 is not bent by the impact of the high-pressure, hot gas.

[0076] like Figure 11As shown, it is a schematic diagram of the heat dissipation structure state when an internal arc fault occurs in the busbar chamber 101 of the switch cabinet. Under the action of high-pressure hot gas, due to the low strength of the side fixed by the nylon screw 8 on the pressure relief cover 4, the pressure relief cover 4 will be quickly opened, and the position where a row of square bending holes 403 are provided thereon will bend and open to the maximum opening. At the same time, the guide baffle 6 rotates clockwise under the impact of the airflow, tightly pressing the left limit plate 5. At the same time, the limiting portion 503 of the right limit plate 5 is impacted and abutted against the steel screw 9 to avoid blocking the high-pressure gas. The high-pressure hot gas is discharged from the switch cabinet body through the top of the guide baffle 6, thereby reducing the impact on the opponent's car chamber 102.

[0077] like Figure 14 As shown, this is a schematic diagram of the heat dissipation structure state when an internal arc fault occurs in the switch cabinet trolley chamber 102. Under the action of high-pressure hot gas, the pressure relief cover 4 is opened to the maximum opening in the same manner as described above. At the same time, the guide baffle 6 rotates counterclockwise under the impact of the airflow, tightly pressing the right limit plate 5. At the same time, the limit portion 503 of the left limit plate 5 is impacted and abutted against the nylon screw 8 to avoid blocking the high-pressure gas. The high-pressure hot gas is discharged from the switch cabinet body through the top of the guide baffle 6, reducing the impact of the high-pressure hot gas on the busbar chamber 101.

[0078] The present invention provides a heat dissipation structure for a large-current switchgear with a shared pressure relief device, which enables the busbar chamber 101 and the trolley chamber 102 of the switchgear to share a set of pressure relief devices. This not only solves the problem of space utilization in the switchgear, so that the installation of the fan no longer affects the normal operation of the pressure relief device, but also can prevent the pressure relief device from opening quickly when an internal arc fault occurs without causing harm to surrounding operators and other equipment.

[0079] Throughout this specification, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the exemplary descriptions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0080] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the described features. In the description of the present invention, "plurality" means at least two, for example, two or three, unless otherwise specifically defined.

[0081] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A heat dissipation structure for a large current switch cabinet with a shared pressure relief device, characterized in that: include: Switchgear frame (1), used to support and install electrical equipment; A fixed partition (2) is arranged inside the switch cabinet frame (1) and divides the interior of the switch cabinet into a busbar chamber (101) and a trolley chamber (102); A heat dissipation fan unit (3) is provided on each side above the switch cabinet frame (1), and the two heat dissipation fan units (3) are used for ventilation and heat dissipation of the busbar room (101) and the trolley room (102) respectively; A pressure relief cover plate (4) is provided on the switch cabinet frame (1) and is located between the two heat dissipation fan units (3), one side of which is a bending portion (401) that is easy to bend, and the other side is a rigid portion (402) that is not easy to bend, the bending portion (401) is connected to the switch cabinet frame (1) through a rigid fastener, and the rigid portion (402) is connected to the switch cabinet frame (1) through a non-rigid fastener, and at least one limiting hole (404) is provided on the plate body of the pressure relief cover plate (4) between the bending portion (401) and the rigid portion (402); A limiting plate (5), one provided on each side of the guide baffle (6), for limiting the turning of the guide baffle (6); The guide baffle (6) has one end hinged to the fixed baffle (2) and the other end inserted into the limiting hole (404) on the pressure relief cover (4), so that the pressure relief cover (4) maintains a limited state.

2. The heat dissipation structure of a large current switch cabinet with a common pressure relief device according to claim 1 is characterized in that: A row of bending holes (403) is provided on one side of the pressure relief cover plate (4); an area close to the bending holes (403) is a bending portion (401); a side of the pressure relief cover plate (4) away from the bending holes (403) is a rigid portion (402); the bending portion (401) is fixed to the switch cabinet frame (1) via rigid fasteners; and the rigid portion (402) is fixed to the switch cabinet frame (1) via non-rigid fasteners.

3. A heat dissipation structure for a large current switch cabinet with a common pressure relief device according to any one of claims 1 or 2, characterized in that: The rigid fasteners are steel screws (9), and the non-rigid fasteners are nylon screws (8).

4. The heat dissipation structure of a large current switch cabinet with a shared pressure relief device according to claim 1 is characterized in that: The two limit plates (5) are respectively hinged to the switch cabinet frame (1), and the two limit plates (5) rotate clockwise and counterclockwise respectively under the action of their own weight until they abut against the switch cabinet frame (1).

5. The heat dissipation structure of a large current switch cabinet with a shared pressure relief device according to claim 4 is characterized in that: The limiting plate (5) is connected to the switch cabinet frame (1) through a hinge group (7), and the limiting plate (5) is integrally formed by an abutting portion (501), a connecting portion (502), and a limiting portion (503). The limiting plate (5) is connected to the hinge group (7) through the connecting portion (502), the abutting portion (501) is arranged to be tilted upward in the horizontal direction of the connecting portion (502), and the limiting portion (503) is arranged to be tilted downward in the horizontal direction of the connecting portion (502).

6. The heat dissipation structure of a large current switch cabinet with a common pressure relief device according to claim 1 is characterized in that: At least one plug-in portion (601) is formed on the end surface of the guide baffle (6) connected to the pressure relief cover (4) and protrudes outwards, and the guide baffle (6) is inserted into the limiting hole (404) of the pressure relief cover (4) through the plug-in portion (601).

7. The heat dissipation structure of a large current switch cabinet with a common pressure relief device according to claim 6, characterized in that: The plug-in portion (601) is inserted into the limiting hole (404) at an angle toward the rigid portion (402) of the pressure relief cover plate (4).

8. The heat dissipation structure of a large current switch cabinet with a common pressure relief device according to claim 1 is characterized in that: A temperature sensor and a controller are also installed in the switch cabinet frame (1), and the controller is electrically connected to the temperature sensor and the heat dissipation fan unit (3) respectively.

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