CN116960775B

CN116960775B - A heat dissipation structure for a large current switch cabinet with a shared pressure relief device

Info

Publication number: CN116960775B
Application number: CN202310711775.9A
Authority: CN
Inventors: 邓炜; 俞杰; 黄建
Original assignee: Anyige Electric Industrial System Shanghai Co ltd
Current assignee: Anyige Electric Industrial System Shanghai Co ltd
Priority date: 2023-06-15
Filing date: 2023-06-15
Publication date: 2025-10-21
Anticipated expiration: 2043-06-15
Also published as: CN116960775A

Abstract

The present invention discloses a heat dissipation structure for a large current switch cabinet with a shared pressure relief device, which belongs to the technical field of switch cabinets. It comprises a switch cabinet frame; a fixed partition plate arranged inside the switch cabinet frame; a heat dissipation fan unit; a pressure relief cover plate, one side of which is easy to bend and the other side is not easy to bend, the bending part is connected to the switch cabinet frame by a rigid fastener, the rigid part is connected to the switch cabinet frame by a non-rigid fastener, and a limiting hole is provided on the pressure relief cover plate; the limiting plate is used to limit the flipping of the guide partition plate; one end of the 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 present invention, the busbar room and the trolley room of the switch cabinet can share a set of pressure relief devices, which 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 avoid the pressure relief device from opening quickly when an internal arc fault occurs without causing harm to surrounding operators and other equipment.

Description

High-current switch cabinet heat radiation structure sharing pressure relief device

Technical Field

The invention relates to a high-current switch cabinet heat radiation structure sharing a pressure relief device, and belongs to the technical field of switch cabinets.

Background

High current switchgear is one of the vital devices in industrial control and distribution systems. In the use process, heat generated by internal elements of the switch cabinet needs to be effectively dissipated in time to ensure continuous and stable operation of the equipment. At present, a common heat dissipation structure of a high-current switch cabinet usually adopts a mounting fan to carry out forced air cooling. However, because the internal space of the switch cabinet is limited, the installation of the fan occupies part of the position of the original pressure relief device, so that the pressure relief device cannot work normally.

In order to solve the problem, a fan and a pressure relief device are generally integrated, so that when an internal arc fault occurs in the switch cabinet, the generated high-pressure hot gas can be flushed away together with the fan, and the purpose of pressure relief is achieved. However, due to the dead weight of the fan, this structure necessarily affects the opening speed of the pressure relief device. In addition, once the fan is thrown out, the fan can possibly cause injury to operators and other equipment, and has certain potential safety hazards.

Therefore, a heat dissipation structure of the high-current switch cabinet needs to be designed, 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 quickly opened and cannot cause injury to surrounding operators and other equipment.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a large-current switch cabinet heat dissipation structure sharing a pressure relief device, which enables a handcart room and a bus room of a switch cabinet to share a set of pressure relief device, so that the problem of space utilization is solved, the normal work of the pressure relief device is not affected by the installation of a fan, an intelligent control technology is also applied, the temperature inside the switch cabinet is monitored and controlled through a temperature sensor and an electronic control device, the rotating speed of the fan is automatically adjusted according to temperature change, and the heat dissipation efficiency and the energy consumption are both considered.

The technical problems to be solved by the invention are realized by adopting the following technical scheme:

a large-current switch cabinet heat radiation structure sharing a pressure relief device comprises a switch cabinet frame, a fixed partition plate, a heat radiation machine set, a pressure relief cover plate, a limit plate and a flow guide partition plate;

wherein the switch cabinet frame is used for supporting and installing electrical equipment;

the fixed partition board is arranged inside the switch cabinet frame and divides the switch cabinet frame into a bus chamber and a handcart chamber;

The heat dissipation fan units are respectively arranged on each side of the switch cabinet frame, and the two heat dissipation fans are respectively used for ventilating and dissipating heat of the bus room and the handcart room;

The pressure relief cover plate is arranged on the switch cabinet frame and positioned between the two heat dissipation fan groups, one side of the pressure relief cover plate is a bending part which is easy to bend, the other side of the pressure relief cover plate is a rigid part which is difficult 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 through a non-rigid fastener, and at least one limiting hole is formed in the plate body of the pressure relief cover plate between the bending part and the rigid part;

the limiting plates are respectively arranged on two sides of the flow guide partition plate and are used for limiting the flow guide partition plate to turn over;

And one end of the flow guide partition plate is hinged with the fixed partition plate, and the other end of the flow guide partition plate is inserted into a limiting hole on the pressure release cover plate, so that the pressure release cover plate is kept in a limiting state.

When one side of the flow guide partition plate is impacted by high-pressure gas, the flow guide partition plate swings to the other side and is abutted to a limiting plate on the corresponding side, the flow guide partition plate guides the gas to a pressure relief cover plate, a non-rigid fastener connected with the switch cabinet frame at the rigid part of the pressure relief cover plate is separated from the switch cabinet frame, the bending part at the other side of the pressure relief cover plate is impacted and bent by the high-pressure gas, the pressure relief cover plate is opened at the moment, and the high-pressure gas is released from the inside of the switch cabinet frame;

as a preferable example, a row of bending holes are formed in one side of the pressure relief cover plate, a bending part is arranged in a region close to the bending holes, a rigid part is arranged on one side of the pressure relief cover plate far away from the bending holes, the bending part of the pressure relief cover plate is fixed with the switch cabinet frame through a rigid fastener, and the rigid part of the pressure relief cover plate is fixed with the switch cabinet frame through a non-rigid fastener.

As a preferred example, the rigid fastener is a steel screw and the non-rigid fastener is a nylon screw.

As a preferable example, the two limiting plates are respectively hinged with the switch cabinet frame, and the two limiting plates respectively rotate clockwise and anticlockwise under the action of self weight of the limiting plates to be propped against the switch cabinet frame.

As a preferred example, the limiting plates are respectively connected to the switch cabinet frame through the hinge groups, the limiting plates are integrally formed by the abutting portions, the connecting portions and the limiting portions in sequence, the limiting plates are connected through the connecting portions in the hinge groups, the abutting portions are obliquely arranged in the horizontal direction of the connecting portions, and the limiting portions are obliquely arranged in the horizontal direction of the connecting portions.

As a preferable example, at least one plug-in part is formed on the end surface of the connection between the flow guide partition plate and the pressure relief cover plate in an outward protruding way, and the flow guide partition plate is inserted into the limit hole of the pressure relief cover plate through the plug-in part.

As a preferable example, the insertion portion is obliquely inserted into the limiting hole toward the rigid portion side of the pressure release cover plate.

As a preferred example, a temperature sensor and a controller are also installed in the switch cabinet frame, and the controller is electrically connected with the temperature sensor and the heat dissipation fan set respectively.

The beneficial effects of the invention are as follows:

According to the high-current switch cabinet heat dissipation structure sharing the pressure relief device, the bus chamber and the handcart chamber of the switch cabinet can share the pressure relief device, so that the problem of space utilization in the switch cabinet is solved, the normal work of the pressure relief device is not affected by the installation of a fan, and the pressure relief device can be prevented from being opened quickly and cannot cause damage to surrounding operators and other equipment when an internal arc fault occurs.

Drawings

Fig. 1 is a schematic perspective view of a heat dissipation structure of a switch cabinet in a normal working state;

Fig. 2 is a schematic top view of a heat dissipation structure of the switch cabinet in a normal working state;

FIG. 3 is a schematic cross-sectional view taken along the direction A-A in FIG. 2;

Fig. 4 is a schematic perspective view of a pressure release cover plate;

FIG. 5 is a schematic top view of a pressure relief cover plate;

FIG. 6 is a schematic perspective view of a baffle;

FIG. 7 is a schematic top view of a baffle;

FIG. 8 is an enlarged schematic view of the limiting plate;

Fig. 9 is a schematic perspective view of a heat dissipation structure of a switch cabinet when an internal arc fault occurs in a handcart room;

FIG. 10 is a schematic top view of the heat dissipation structure of the switchgear when an internal arc fault occurs in the handcart room;

FIG. 11 is a schematic cross-sectional view taken along the direction B-B in FIG. 10;

FIG. 12 is a schematic perspective view of a heat dissipating structure of a switchgear when an internal arc fault occurs in a bus bar compartment;

FIG. 13 is a schematic top view of the heat dissipation structure of the switchgear when an internal arc fault occurs in the bus bar compartment;

Fig. 14 is a schematic view of a sectional structure along the direction C-C in fig. 13.

In the figure:

1. A switch cabinet frame; 101, a bus room, 102, a handcart room;

2. fixing the partition board;

3. a heat dissipation fan unit;

4. a pressure relief cover plate; 401, bending parts, 402, rigid parts, 403, bending holes, 404 and limiting holes;

5. the device comprises a limiting plate, a abutting part, a connecting part, a limiting part and a connecting part, wherein the limiting plate is arranged on the abutting part;

6. 601, plug-in part;

7. A hinge group;

8. Nylon screws;

9. steel screw.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" indicate orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, or communicable with each other, directly connected, indirectly connected via an intermediary, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed.

Referring to fig. 1-3, an embodiment of the present invention provides a heat dissipation structure of a heavy current switch cabinet sharing a pressure relief device, which mainly includes a switch cabinet frame 1, a fixed partition board 2, a heat dissipation fan set 3, a pressure relief cover board 4, a limiting board 5 and a flow guide partition board 6.

The switchgear frame 1 is a structural frame for supporting and mounting electrical equipment, among other things, for electrical distribution systems in power systems, industrial automation, buildings and the like. The design and construction of the frame ensures safe operation of the electrical equipment and provides an environment for ease of maintenance and operation.

In this embodiment, the switch cabinet frame 1 is made of a metal material, which may be a steel plate or an aluminum alloy. The steel plate or the aluminum alloy material has a firm structure and good corrosion resistance, and can bear the weight of electric equipment and various external environmental conditions. The appearance of the frame may be tailored to specific needs, such as a coating or surface treatment, to increase its durability and appearance appeal.

The design of the switchgear cabinet frame 1 takes into account, among other things, the following factors:

load-bearing capacity the frame must be able to support all electrical equipment mounted therein and have sufficient strength and rigidity to prevent deformation or tilting.

Spatial layout-the frame should provide enough space to mount switchgear, protection equipment and wiring, as well as accommodate the necessary power distribution components and accessories.

Ventilation and heat dissipation the switchgear cabinet frame 1 should be designed to have good ventilation and heat dissipation properties to ensure that the installed equipment is effectively cooled during operation and to prevent overheating.

Safety-the frame should be provided with protective measures, such as reliable grounding and insulation properties, to ensure the safety of operators and equipment.

Maintenance and operational convenience the frame should provide convenient maintenance and operational access, such as doors, signs and lights, etc., that are easy to open and close.

In the prior art, the existing high-current switch cabinet heat radiation structure usually adopts a mounting fan to carry out forced air cooling, but because of limited space, the mounting of the fan occupies part of the positions of the original pressure relief device. To solve this problem, a fan and a pressure relief device are usually combined into one, but the opening speed of the pressure relief device is affected due to the dead weight of the fan. In addition, once the fan is thrown out, the fan can possibly cause injury to operators and other equipment, and has certain potential safety hazard. Therefore, the invention provides a novel high-current switch cabinet heat dissipation structure, which solves the problems of space utilization and safety.

Specifically, as shown in fig. 3, a fixed partition plate 2 is provided in the switchgear frame 1 of the present invention, and the fixed partition plate 2 is made of sheet metal material, is provided inside the switchgear frame 1, and is used for partitioning the inside of the switchgear frame 1 into a bus bar compartment 101 and a handcart compartment 102. The busbar compartment 101 and the cart compartment 102 are two important components in the power system.

The bus bar compartment 101 is one of the equipment compartments in the electrical cabinet for connecting and distributing the main power bus bars in the power system. The power bus is a conductive device for transmitting a large amount of electric energy, and is composed of conductor bars or pipes. The bus bar compartment 101 transfers power from a power plant or substation to various points of load by connecting components such as a power source, a power transformation device, and a load. The bus bar compartment 101 is also responsible for switching in and out of branch circuits, as well as monitoring and protecting the current and voltage in the power system.

The cart bay 102 is an equipment bay in the switchgear for controlling, protecting and isolating electrical equipment. The cart bay 102 contains power switching devices, such as circuit breakers, disconnectors, load switches, etc., for controlling and distributing current in the power system. The cart bay 102 may also include other devices such as voltage transformers, current transformers, protective relays, and the like. The primary function of the cabin 102 is to quickly isolate damaged equipment and ensure safe operation of the power system in the event of a power system failure.

As shown in fig. 1-3, two heat dissipation fan groups 3 are provided, each group comprises three fans, a group of heat dissipation fan groups 3 is respectively installed on two sides above the switch cabinet frame 1, and the two heat dissipation fan groups 3 are respectively used for ventilation and heat dissipation of the bus room 101 and the handcart room 102.

As other implementation manners in the embodiment of the present invention, a temperature sensor (not shown) and a controller (not shown) are further installed in the switch cabinet frame 1, and the controller is electrically connected with the temperature sensor and the heat dissipation fan set 3, respectively.

As shown in fig. 1-3, the pressure release cover plate 4 is disposed on the switch cabinet frame 1 and is located between two heat dissipation fan groups 3, as shown in fig. 4 and 5, a side, close to the upper side of the handcart room 102, of the pressure release cover plate 4 is a bending part 401 easy to bend, a side, close to the busbar room 101, is a rigid part 402 difficult to bend, the bending part 401 is connected with the switch cabinet frame 1 through a rigid fastener, the rigid part 402 is connected with the switch cabinet through a non-rigid fastener, and at least one limiting hole 404 is formed in a plate body of the pressure release cover plate 4 between the bending part 401 and the rigid part 402, as shown in fig. 4 and 5, in the embodiment of the invention, the limiting hole 404 is in a strip shape and has three limiting holes.

Specifically, as shown in fig. 3-5, in this embodiment, the bending portion 401 that is easy to bend is implemented 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 punching, in this embodiment, the bending holes 403 are rectangular holes, the area near the bending holes 403 is the bending portion 401, the arrangement of the bending holes 403 ensures that the bending portion 401 is easy to bend, the side of the pressure relief cover plate 4 far from the bending holes 403 is a rigid portion 402, the bending portion 401 of the pressure relief cover plate 4 is fixed with the switch cabinet frame 1 through a rigid fastener, and the rigid portion 402 of the pressure relief cover plate 4 is fixed with the switch cabinet frame 1 through a non-rigid fastener.

Specifically, the steel screw 9 is adopted as the rigid fastener, the nylon screw 8 is adopted as the non-rigid fastener, although the nylon screw 8 has good corrosion resistance, chemical corrosion resistance and insulating property, the nylon screw is relatively brittle, and is not suitable for bearing high strength or high load, while the steel screw nut has high strength, high wear resistance and durability, and can be used for bearing high strength or high load, 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, so that the pressure release cover plate 4 can be ensured not to be integrally impacted and separated when being impacted by high pressure gas.

Specifically, as shown in fig. 3, two limiting plates 5 are provided, one is respectively disposed at each side of the flow guiding partition plate 6, and the limiting plates 5 are respectively disposed at both sides of the bottom of the pressure releasing cover plate 4, the limiting plates 5 are respectively hinged with the switch cabinet frame 1 through hinge groups 7, the limiting plates 5 are used for limiting the turnover of the flow guiding partition plate 6, as shown in fig. 8, the limiting plates 5 are sequentially formed by integrally forming a abutting part 501, a connecting part 502 and a limiting part 503, the limiting plates 5 are connected with the hinge groups 7 through the connecting part 502, the abutting part 501 is obliquely disposed in the horizontal direction of the connecting part 502, and the limiting part 503 is obliquely disposed in the horizontal direction of the connecting part 502. The two limiting plates 5 rotate clockwise and anticlockwise under the action of the dead weight of the limiting plates respectively to be propped against the switch cabinet frame 1.

Specifically, as shown in fig. 3, the bottom end of the flow guide partition 6 is hinged to the top end of the fixed partition 2 through the hinge group 7, the flow guide partition 6 and the fixed partition 2 form an integral partition so as to enable the bus chamber 101 to be completely separated from the handcart chamber 102, as shown in fig. 3 and fig. 6-7, three inserting parts 601 are formed by the flow guide partition 6 body through sheet metal in an outward protruding mode on the end face, connected with the pressure release cover plate 4, of the flow guide partition 6, and the three inserting parts 601 can be just inserted into three limiting holes 404 on the pressure release cover plate 4, so that the pressure release cover plate 4 is kept in a limiting state. The plugging portions 601 are obliquely inserted into the limiting holes 404 toward one side of the rigid portion 402 of the pressure relief cover plate 4, so that the pressure relief cover plate 4 can be easily separated from the flow guide partition plate 6, and rapid pressure relief is guaranteed.

When one side of the flow guide partition plate 6 is impacted by high-pressure gas, the flow guide partition plate 6 swings to the other side and is abutted to the limiting plate 5 on the corresponding side, the flow guide partition plate 6 guides the gas to the pressure release cover plate 4, a non-rigid fastener connected with the switch cabinet frame 1 at the rigid part 402 of the pressure release cover plate 4 is separated from the switch cabinet frame 1, the bending part 401 on the other side of the pressure release cover plate 4 is impacted and bent by the high-pressure gas, at the moment, the pressure release cover plate 4 is opened, and the high-pressure gas is released from the inside of the switch cabinet frame 1.

Working principle:

As shown in fig. 3, a schematic diagram of a state of the heat dissipation structure of the switch cabinet under a normal working condition is shown, that is, when no arc fault occurs in the bus room 101 and the handcart room 102 in the switch cabinet, the heat dissipation unit 3 respectively dissipates the air in the bus room 101 and the handcart room 102, at this time, the plug-in portion 601 at the top of the flow guide partition plate 6 is inserted into the limit hole 404 at the middle position of the pressure release cover plate 4, and the two limit plates 5 rotate clockwise and anticlockwise under the action of their own weights respectively to be propped against the switch cabinet frame 1. The rigid part 402 side of the pressure relief cover plate 4 is connected to the switch cabinet frame 1 through nylon screws 8, the bending part 401 side of the pressure relief cover plate 4 is connected to the switch cabinet frame 1 through steel screws 9, and the pressure relief cover plate 4 is not impacted and bent by high-pressure hot gas.

As shown in fig. 11, which is a schematic diagram of a heat dissipation structure state when an internal arc fault occurs in the bus chamber 101 of the switch cabinet, under the action of high-pressure hot gas, since the strength of one side of the pressure release cover plate 4 fixed by the nylon screw 8 is low, the pressure release cover plate 4 can be quickly opened, the position provided with a row of square bending holes 403 is bent and opened to the maximum opening, meanwhile, the flow guide baffle plate 6 rotates clockwise under the impact of air flow to tightly press the left side limiting plate 5, and meanwhile, the limiting part 503 of the right side limiting plate 5 is in impact and abutting connection with the steel screw 9, so that the high-pressure hot gas is prevented from blocking the high-pressure gas, and is discharged out of the switch cabinet body above the flow guide baffle plate 6, thereby reducing the influence on the car chamber 102.

As shown in fig. 14, which is a schematic diagram of a heat dissipation structure state when an internal arc fault occurs in the handcart room 102 of the switch cabinet, under the action of high-pressure hot gas, the pressure release cover plate 4 is opened to the maximum opening in the same manner as described above, meanwhile, the flow guide partition plate 6 rotates anticlockwise under the impact of the airflow, so as to tightly press the right side limiting plate 5, and meanwhile, the limiting part 503 of the left side limiting plate 5 is impacted and abutted to the nylon screw 8, so that the high-pressure gas is prevented from being blocked, the high-pressure hot gas is discharged out of the switch cabinet body above the flow guide partition plate 6, and the influence of the high-pressure hot gas on the bus room 101 is reduced.

According to the high-current switch cabinet heat dissipation structure sharing the pressure relief device, the bus chamber 101 and the handcart chamber 102 of the switch cabinet can share one set of pressure relief device, so that the problem of space utilization in the switch cabinet is solved, the normal work of the pressure relief device is not affected by the installation of a fan, and the situation that the pressure relief device can be opened quickly and can not cause damage to surrounding operators and other equipment when an internal arc fault occurs can be avoided.

In the description of the present specification, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "an exemplary embodiment," "an example," "a particular example," or "some examples" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, unless specifically defined otherwise.

Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by those skilled in the art within the scope of the invention, which is defined by the claims and their equivalents.

Claims

1. The utility model provides a high-current switch cabinet heat radiation structure who shares pressure release device which characterized in that includes:

a switch cabinet frame (1) for supporting and mounting electrical equipment;

a fixed partition plate (2) which is arranged inside the switch cabinet frame (1) and divides the inside into a bus chamber (101) and a handcart chamber (102);

the two heat dissipation air units (3) are respectively arranged on two sides above the switch cabinet frame (1), and the two heat dissipation air units (3) are respectively used for ventilating and dissipating heat of the bus room (101) and the handcart room (102);

The pressure relief cover plate (4) is arranged on the switch cabinet frame (1) and positioned between the two heat dissipation air units (3), one side of the pressure relief cover plate is a bending part (401) which is easy to bend, the other side of the pressure relief cover plate is a rigid part (402) which is difficult to bend, the bending part (401) is connected with the switch cabinet frame (1) through a rigid fastener, the rigid part (402) is connected with the switch cabinet frame (1) through a non-rigid fastener, and at least one limiting hole (404) is formed in a plate body of the pressure relief cover plate (4) between the bending part (401) and the rigid part (402);

the limiting plates (5) are respectively arranged at two sides of the flow guide partition plate (6) and are used for limiting the flow guide partition plate (6) to turn over;

and one end of the flow guide partition plate (6) is hinged with the fixed partition plate (2), and the other end of the flow guide partition plate is inserted into a limiting hole (404) on the pressure release cover plate (4) so that the pressure release cover plate (4) is kept in a limiting state.

2. The large-current switch cabinet radiating structure sharing a pressure relief device according to claim 1, wherein a row of bending holes (403) are formed in one side of the pressure relief cover plate (4), a bending portion (401) is arranged in a region close to the bending holes (403), a rigid portion (402) is arranged in one side of the pressure relief cover plate (4) away from the bending holes (403), the bending portion (401) is fixed with a switch cabinet frame (1) through a rigid fastener, and the rigid portion (402) is fixed with the switch cabinet frame (1) through a non-rigid fastener.

3. A high current switchgear heat dissipating arrangement for a common pressure relief device according to any of the claims 1 or 2, wherein said rigid fastener is a steel screw (9) and said non-rigid fastener is a nylon screw (8).

4. The high-current switch cabinet heat dissipation structure sharing the pressure relief device according to claim 1, wherein the two limiting plates (5) are hinged to the switch cabinet frame (1) respectively, and the two limiting plates (5) rotate clockwise and anticlockwise under the action of self weight of the limiting plates respectively to abut against the switch cabinet frame (1).

5. The large-current switch cabinet radiating structure of the shared pressure relief device according to claim 4, wherein the limiting plates (5) are connected to the switch cabinet frame (1) through hinge groups (7) respectively, the limiting plates (5) are integrally formed by abutting portions (501), connecting portions (502) and limiting portions (503) in sequence, the limiting plates (5) are connected to the hinge groups (7) through the connecting portions (502), the abutting portions (501) are arranged in an upward inclined mode in the horizontal direction of the connecting portions (502), and the limiting portions (503) are arranged in a downward inclined mode in the horizontal direction of the connecting portions (502).

6. The large-current switch cabinet heat dissipation structure sharing a pressure relief device according to claim 1, wherein at least one plug-in part (601) is formed on the end surface of the connection between the flow guide partition plate (6) and the pressure relief cover plate (4) in an outward protruding mode, and the flow guide partition plate (6) is inserted into a limit hole (404) of the pressure relief cover plate (4) through the plug-in part (601).

7. The high-current switch cabinet heat dissipation structure sharing a pressure relief device according to claim 6, wherein the plugging portion (601) is obliquely inserted into the limiting hole (404) toward one side of the rigid portion (402) of the pressure relief cover plate (4).

8. The high-current switch cabinet heat dissipation structure sharing the pressure relief device according to claim 1, wherein a temperature sensor and a controller are further installed in the switch cabinet frame (1), and the controller is electrically connected with the temperature sensor and the heat dissipation fan set (3) respectively.