Rail transit electric appliance cabinet heat dissipation device

Abstract

The utility model belongs to the technical field of electric cabinet, specifically discloses a rail transit electric cabinet heat abstractor, including air intake, air outlet, air duct, filter screen, a plurality of cooling fin and fan, air intake and air outlet all set up on the outer wall of electric cabinet, and air outlet is equipped with one -way valve that unidirectionally leads to the electric cabinet outside, one end of air duct is communicated with air intake, and the other end is towards the electric appliance in electric cabinet, filter screen sets up air intake, and with electric cabinet outer wall detachable connection, cooling fin is installed on the both sides inner wall of air duct, and adjacent cooling fin is relatively staggered and is set up, and the fan sets up at air outlet. Adopt this technical scheme, utilize filter screen to filter dust, reduce dust to enter electric cabinet, based on cooling fin and one -way valve, avoid air -outlet direct exposure to the outside environment, and optimize the heat dissipation effect.

Description

Technical Field

[0001] This utility model belongs to the field of electrical cabinet technology and relates to a heat dissipation device for an electrical cabinet in rail transit. Background Technology

[0002] The electrical control cabinet in rail transit is a core component responsible for power management, equipment control, and protection in trains. Its function and structure involve several key technical fields. The electrical control cabinet is responsible for converting direct current (DC) to alternating current (AC) to power equipment such as traction motors and air compressors, while also controlling power distribution and safety protection during train operation.

[0003] Electrical cabinets typically house numerous electrical modules that generate significant heat during operation. This heat accumulation can cause the cabinet's internal temperature to rise, affecting its normal operation. To dissipate this heat promptly, electrical cabinets are usually equipped with ventilation holes and fans for air cooling.

[0004] In existing technologies, fan cooling is used for heat dissipation, and the heat dissipation holes are directly exposed to the external environment. Dust from the external environment enters the cabinet with the airflow and accumulates on the surface of electrical components (the annual dust accumulation in the cabinet of a certain subway car can reach more than 300g), which will trigger a series of chain reactions and seriously affect the reliability of the equipment and operational safety. Utility Model Content

[0005] The purpose of this utility model is to provide a heat dissipation device for rail transit electrical cabinets, which avoids the heat dissipation holes being directly exposed to the external environment and reduces dust entering the electrical cabinet.

[0006] To achieve the above objectives, the basic solution of this utility model is: a heat dissipation device for a rail transit electrical cabinet, including an air inlet, an air outlet, an air duct, a filter, multiple cooling fins, and a fan;

[0007] Both the air inlet and the air outlet are located on the outer wall of the electrical cabinet, and the air outlet is equipped with a one-way valve that leads to the outside of the electrical cabinet.

[0008] One end of the air duct is connected to the air inlet, and the other end faces the electrical equipment inside the electrical cabinet;

[0009] The filter screen is located at the air inlet and is detachably connected to the outer wall of the electrical cabinet;

[0010] The cooling fins are installed on the inner walls of both sides of the air duct, and adjacent cooling fins are arranged in a staggered manner. The fan is located at the end of the air duct away from the air inlet.

[0011] The working principle and beneficial effects of this basic solution are as follows: A filter screen is installed at the air inlet to filter dust at the air intake, preventing dust from being brought into the electrical cabinet during fan operation. Simultaneously, a one-way valve is installed at the air outlet, allowing air containing dust to flow out of the electrical cabinet. This prevents dusty air from entering the electrical cabinet from the outlet. Thus, neither the air inlet nor the air outlet is directly exposed to the external environment, reducing the amount of dust entering the electrical cabinet.

[0012] Air is drawn into the electrical cabinet along the air duct, blowing on the equipment inside the cabinet, and then discharged from the air outlet, achieving heat exchange between the internal and external airflows and dissipating heat to achieve heat dissipation.

[0013] Cooling fins are installed inside the fan. When the temperature inside the electrical cabinet is too high, the cooling fins can be activated to lower the air temperature in the air duct, so that the air blowing towards the equipment inside the electrical cabinet can be cooled more effectively. Furthermore, the adjacent cooling fins are arranged in a staggered manner, allowing air to move back and forth between the cooling fins, resulting in more thorough cooling and better heat dissipation.

[0014] Furthermore, it also includes a guiding mechanism, which comprises two guide plates, a complete gear, an incomplete gear, and a power source;

[0015] The end of the air duct that is not connected to the air inlet faces the middle of the electrical cabinet. One end of each of the two guide plates is rotatably mounted on the upper and lower side walls of the end of the air duct facing the middle of the electrical cabinet. The two guide plates are arranged in parallel.

[0016] The complete gear is fixedly connected to the rotating shaft of the guide plate, and the incomplete gear can mesh with the complete gear;

[0017] The power source is connected to the central shaft of the incomplete gear and is used to control the incomplete gear to rotate in the opposite direction.

[0018] When the fan starts, air enters the duct through the air inlet and is then discharged into the electrical cabinet from the duct outlet. Two guide plates are installed at the duct outlet; the direction of the airflow is guided by the swing angle of the guide plates. The guide plates swing up and down, achieving vertical airflow and heat dissipation throughout the electrical components. Increasing the airflow angle results in a higher heat dissipation area coverage and better heat dissipation effect.

[0019] When the power source is started, it drives the incomplete gear to rotate. Once the incomplete gear rotates to mesh with the complete gear, it drives the complete gear to rotate. The rotation of the complete gear causes the rotating shaft and guide plate to swing upward.

[0020] The guide plate swings until it reaches its limit position. At this point, the teeth of the incomplete gear rotate to the side away from the complete gear, and the incomplete gear no longer meshes with the complete gear. The guide plate then swings downward under its own weight, automatically resetting itself. After resetting, the teeth of the incomplete gear mesh with the complete gear again, repeating the upward swing operation. This process is repeated to achieve the up-and-down swinging of the guide plate.

[0021] Furthermore, it also includes a temperature sensor, a temperature comparator, and a display module;

[0022] The temperature sensor is installed on the inner wall of the electrical cabinet. The output terminal of the temperature sensor is connected to the first input terminal of the temperature comparator. The second input terminal of the temperature comparator is connected to a temperature threshold memory. The output terminal of the temperature comparator is connected to the control terminal of the fan, power source, and cooling plate.

[0023] The display module is located in the control room where the staff are located, and the input terminal of the display module is connected to the output terminal of the temperature comparator.

[0024] Temperature sensors are installed to collect temperature signals inside the electrical cabinet, allowing for monitoring of the cabinet's internal conditions and enabling appropriate measures to be taken to ensure its safety. A temperature comparator receives the collected temperature signal and compares it with temperature thresholds stored in a temperature threshold memory. If the collected temperature signal is greater than or equal to the temperature threshold, a control signal is output to the control terminals of the fan, power source, and cooling fins, activating these three devices to ventilate and dissipate heat into the electrical cabinet.

[0025] Meanwhile, the output of the temperature sensor is connected to the display module, and the collected temperature signal can be transmitted to the display module for display, making it convenient for staff to view.

[0026] Furthermore, it also includes an extension branch pipe, one end of which is connected to the side wall of the air duct, and the other end is located on the side of the equipment that is prone to overheating inside the electrical cabinet and faces the equipment.

[0027] Installing extension branch pipes diverts part of the air entering from the duct into the branch pipes, and the air flows along the branch pipes to the electrical cabinet for equipment that is prone to overheating, thus providing targeted heat dissipation and achieving better heat dissipation results.

[0028] Furthermore, the inner wall of the air duct is provided with multiple quick-plug interfaces, and the cooling plate is plugged into the quick-plug interfaces.

[0029] The system features a quick-connect interface for easy installation and removal of the cooling fins, facilitating maintenance and replacement.

[0030] Furthermore, the air duct adopts a multi-section bent pipe, and the pipe is made of a heat-conducting material;

[0031] The air duct is located on the side of the electrical cabinet where the equipment prone to overheating is located.

[0032] The air duct employs multiple bends to extend its length, allowing for thorough cooling of the air within the duct and resulting in better cooling of the air blown into the electrical cabinet. Furthermore, the duct is made of thermally conductive material, enabling direct heat exchange between the cooling fins within the duct and the electrical cabinet, thus facilitating heat dissipation. The air duct is also positioned on the side of the electrical cabinet where easily overheated equipment is located to facilitate heat exchange and cooling of this equipment.

[0033] Furthermore, it also includes multiple control buttons, which are installed on the outer wall of the electrical cabinet or in the control room where the staff is located. The output terminals of the control buttons are respectively connected to the control terminals of the fan, power source, and cooling plate.

[0034] The system includes control buttons for manual control of the fan, power source, and cooling fins, allowing for greater flexibility in operation.

[0035] Furthermore, the filter screen is a magnetic filter screen, which is magnetically connected to the outer wall of the electrical cabinet.

[0036] The magnetic filter is magnetically attached to the outer wall of the appliance cabinet, making it easy to disassemble and replace. Attached Figure Description

[0037] Figure 1 This is a side view of the heat dissipation device for the electrical cabinet of the rail transit system according to this utility model.

[0038] Figure 2 yes Figure 1 A partially enlarged schematic diagram of the central guide mechanism;

[0039] Figure 3 This is a perspective view of the electrical cabinet of the rail transit electrical cabinet heat dissipation device of this utility model.

[0040] The reference numerals in the accompanying drawings include: air inlet 1, air outlet 2, air duct 3, filter screen 4, cooling plate 5, fan 6, guide plate 7, complete gear 8, incomplete gear 9, power source 10, temperature sensor 11, temperature comparator 12, extension branch pipe 13, control button 14, electrical cabinet 15, one-way valve 16. Detailed Implementation

[0041] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0042] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0043] In the description of this utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0044] This utility model discloses a heat dissipation device for an electrical cabinet in rail transit, such as... Figure 1 and Figure 3 As shown, it includes an air inlet 1, an air outlet 2, an air duct 3, a filter 4, multiple cooling fins 5 (using existing cooling fin devices, such as AA-53100, PF513-30B, etc.), and a fan 6 (such as EFB0512HA, AUB0912HS, R2E220-AN, etc.).

[0045] Both the air inlet 1 and the air outlet 2 are located on the outer wall of the electrical cabinet 15. The air outlet 2 is equipped with a one-way valve 16 that allows one-way flow to the outside of the electrical cabinet 15. One end of the air duct 3 is connected to the air inlet 1, and the other end is directed toward the electrical equipment inside the electrical cabinet 15.

[0046] The filter 4 is located at the air inlet 1 and is detachably connected to the outer wall of the electrical cabinet 15 (e.g., by snap-fit). Preferably, the filter 4 is a magnetic filter 4, which is magnetically connected to the outer wall of the electrical cabinet 15. The outer wall of the electrical cabinet 15 can be made of stainless steel, aluminum alloy, or other metal materials to facilitate magnetic connection. The magnetic connection between the filter 4 and the outer wall of the electrical cabinet 15 makes it easy to install, remove, and replace the filter 4.

[0047] Cooling fins 5 are installed on the inner walls of both sides of the air duct 3, and adjacent cooling fins 5 are arranged in a staggered manner. Fans 6 are installed (such as by bonding, welding, riveting, screw connection, etc.) at the end of the air duct 3 away from the air inlet 1. One or more air outlets 2 can be provided to meet the heat dissipation requirements.

[0048] A filter screen 4 is installed at the air inlet 1 to filter dust at the air inlet, preventing dust from being brought into the electrical cabinet 15 when the fan 6 is running and dissipating heat. At the same time, a one-way valve 16 is installed at the air outlet 2 to allow one-way air to flow out of the electrical cabinet 15, preventing dusty air from entering the electrical cabinet 15 from the air outlet 2. In this way, neither the air inlet 1 nor the air outlet 2 is directly exposed to the external environment, reducing the amount of dust entering the electrical cabinet 15.

[0049] Air is discharged into the electrical cabinet 15 along the air duct 3, blowing on the equipment inside the electrical cabinet 15, and is discharged from the air outlet 2, realizing the heat exchange between the internal and external airflows and dissipating the heat to achieve heat dissipation.

[0050] Cooling fins 5 are installed inside the fan 6. When the temperature inside the electrical cabinet 15 is too high, the cooling fins 5 can be activated to lower the air temperature in the air duct 3, so that the air blowing towards the equipment inside the electrical cabinet 15 can be cooled more effectively. Furthermore, the adjacent cooling fins 5 are arranged in a staggered manner, allowing the air to move back and forth between the cooling fins 5, resulting in more thorough cooling and better heat dissipation.

[0051] In a preferred embodiment of this utility model, such as Figure 2 As shown, the heat dissipation device of the rail transit electrical cabinet 15 also includes a guide mechanism, which includes two guide plates 7, a complete gear 8, an incomplete gear 9, and a power source 10, which can be an electric motor.

[0052] The end of the air duct 3 that is not connected to the air inlet 1 (i.e., the end point) faces the middle of the electrical cabinet 15. One end of each of the two guide plates 7 is rotatably mounted on the upper and lower side walls of the end of the air duct 3 facing the middle of the electrical cabinet 15, and the two guide plates 7 are arranged in parallel. Preferably, the length of the end port of the air duct 3 can be equal to the width of the electrical cabinet 15, so as to provide air cooling for all components within the horizontal width range of the electrical cabinet 15.

[0053] The guide plate 7 has rotating shafts fixedly connected to both ends. These shafts can be made of smooth materials (such as engineering plastics, graphite copper alloys, titanium nitride (TiN) coatings, etc.). Rotary holes are provided on the air duct 3 housing, and the rotating shafts are rotatably connected to these holes. The outer wall of the rotating shaft and the inner wall of the rotating hole are polished smooth to minimize friction, thus meeting the requirement that the guide plate 7 can automatically swing downwards under gravity. The central shaft of the complete gear 8 is fixedly connected to the rotating shaft of the guide plate 7 (e.g., by welding, bonding, etc.), and the incomplete gear 9 can mesh with the complete gear 8.

[0054] The power source 10 is connected to the central shaft of the incomplete gear 9. The power source 10 is fixedly installed (such as by riveting, screw connection, welding, etc.) on the side wall of the air duct 3. The output shaft of the power source 10 and the central shaft of the incomplete gear 9 can be connected by welding, pin connection, etc. The power source 10 is used to control the reverse rotation of the incomplete gear 9.

[0055] When fan 6 starts, air enters duct 3 through air inlet 1 and is then discharged into electrical cabinet 15 through the port of duct 3. Two guide plates 7 are installed at the port of duct 3. The direction of airflow from duct 3 is guided by the swing angle of the guide plates 7. The guide plates 7 swing up and down to achieve vertical air sweeping, which sweeps air to all parts of the electrical appliance for heat dissipation. Increasing the sweeping angle results in a higher heat dissipation area coverage and better heat dissipation effect.

[0056] When the power source 10 is started, it drives the incomplete gear 9 to rotate. When the incomplete gear rotates to mesh with the complete gear 8, it drives the complete gear 8 to rotate. The rotation of the complete gear 8 causes the rotating shaft and guide plate 7 to swing upward.

[0057] Until the guide plate 7 swings to its limit position (which can be achieved by setting the arc length of the toothed portion of the incomplete gear 9, which can be adjusted as needed during manufacturing), the toothed portion of the incomplete gear 9 rotates to the side away from the complete gear 8, and the incomplete gear 9 no longer meshes with the complete gear 8. At this time, the guide plate 7 swings downward under its own gravity, achieving automatic downward swing reset. After resetting, the teeth of the incomplete gear 9 mesh with the complete gear 8 again, repeating the upward swing operation, and so on, to achieve the up-and-down reciprocating swing of the guide plate 7.

[0058] In a preferred embodiment of this utility model, the heat dissipation device of the rail transit electrical cabinet 15 further includes a temperature sensor 11, a temperature comparator 12, and a display module. The temperature sensor 11 in this embodiment can be a digital sensor, such as TMP117, MAX31875, LM75B, etc., or an analog output sensor, such as PT1000, KTY84-130, etc. The temperature comparator 12 can also be an analog comparator or a digital comparator as needed, such as LM2903, MAX9022, TMP302, LTC1540, etc. A digital-to-analog converter (such as DAC8760, AD5758, DAC80508, etc.) or an analog-to-digital converter (such as ADS114S08, LTC2498, AD4003, etc.) can be electrically connected to the output terminal of the temperature sensor 11 to meet signal transmission requirements.

[0059] Temperature sensor 11 is mounted (e.g., glued, welded, embedded, etc.) on the inner wall of electrical cabinet 15. The output terminal of temperature sensor 11 is electrically connected to the first input terminal of temperature comparator 12. The second input terminal of temperature comparator 12 is electrically connected to a temperature threshold memory (e.g., AT24C02D, CAT24C208, DS28E01, AD5171, etc.). The output terminal of temperature comparator 12 is electrically connected to the control terminals of fan 6, power source 10, and cooling plate 5.

[0060] The display module is installed in the control room where the staff are located. The input terminal of the display module is electrically connected to the output terminal of the temperature comparator 12. The display module can be a smart display screen, computer monitor, or other similar device, and can be placed directly or hung in the control room where the staff are located.

[0061] Temperature sensor 11 is installed to collect temperature signals inside electrical cabinet 15 in order to understand the situation inside electrical cabinet 15 and take appropriate measures to ensure the safety of electrical cabinet 15. Temperature comparator 12 receives the collected temperature signal and compares it with the temperature threshold in temperature threshold memory. If the collected temperature signal value is greater than or equal to the temperature threshold, it outputs control signals to the control terminals of fan 6, power source 10, and cooling plate 5 to start these three devices and ventilate and dissipate heat into electrical cabinet 15.

[0062] Meanwhile, the output of temperature sensor 11 is electrically connected to the display module via a wireless transmission module (such as 5G network, ESP32-WROOM-32UE, S2-LP, BG96, HMS Anybus WLM-5100, TI IWR6843, WiFi, etc.). The collected temperature signal can be transmitted to the display module for display, making it convenient for staff to view.

[0063] In a preferred embodiment of this utility model, the heat dissipation device for the rail transit electrical cabinet 15 further includes an extension branch pipe 13. One end of the extension branch pipe 13 is connected to the side wall of the air duct 3, and the other end is located on the side of the equipment prone to overheating inside the electrical cabinet 15, facing the equipment. The branch pipe can be positioned inside the electrical cabinet 15 by means of an internal metal bracket, etc. The metal bracket can be connected to the inner wall of the electrical cabinet 15 by welding, riveting, or other methods.

[0064] An extension branch pipe 13 is installed to divert part of the air input from the air duct 3 into the branch pipe, and then flow along the branch pipe to the equipment in the electrical cabinet 15 that is prone to overheating, so as to provide targeted heat dissipation and achieve better heat dissipation effect.

[0065] Preferably, the inner wall of the air duct 3 is provided with multiple quick-plug interfaces, and the cooling plate 5 is plugged into the quick-plug interfaces. An integrated circuit is installed in the quick-plug interface and electrically connected to the battery through a concealed circuit, so as to supply power to the cooling plate 5 when it is inserted into the quick-plug interface.

[0066] The quick-connect interface allows for rapid installation and removal of the cooling plate 5, facilitating maintenance and replacement.

[0067] In a preferred embodiment of this utility model, the air duct 3 adopts a multi-section bent pipe, and the pipe is made of a heat-conducting material (such as aluminum alloy, graphene-reinforced aluminum-based composite material, carbon fiber / metal laminate, metal foam (aluminum / copper) etc.). The air duct 3 is located on the side of the electrical cabinet 15 where the equipment is prone to overheating.

[0068] The air duct 3 employs a multi-section bend design, extending its length and allowing for thorough cooling of the air within it. This results in even better cooling of the air blown into the electrical cabinet 15. Furthermore, the pipe is made of thermally conductive material, enabling direct heat exchange between the cooling fins 5 within the air duct 3 and the electrical cabinet 15, facilitating heat dissipation. The air duct 3 is also positioned on the side of the electrical cabinet 15 where easily overheated equipment is located, facilitating heat exchange and cooling of this equipment.

[0069] Preferably, if the cooling fins 5 condense the air excessively and produce condensate, a drain pipe can be connected at the lowest point of the bend in the pipe. The drain pipe extends out of the electrical cabinet 15 and is connected to a container (such as a water tank or water cylinder) for storing the condensate. The drain pipe is equipped with a water valve, which can be opened when needed to drain the condensate in the air duct 3 into the external container.

[0070] Drying filters 4 (such as DFM-50H, D-MEM120, E-Dry300, etc.) can also be installed at the air inlet 1 and the end of the air duct 3 to directly filter the moisture that may be present in the air and ensure that the gas is dry.

[0071] In a preferred embodiment of this utility model, the heat dissipation device of the rail transit electrical cabinet 15 further includes multiple control buttons 14. The control buttons 14 are installed (e.g., glued, welded, riveted, snap-fitted, etc.) on the outer wall of the electrical cabinet 15 or in the control room where the staff is located. The output terminals of the control buttons 14 are electrically connected to the control terminals of the fan 6, the power source 10, and the cooling plate 5, respectively. All electrical equipment in this utility model can be powered by modules such as storage batteries. The storage batteries can be installed inside or outside the electrical cabinet 15, and can be equipped with conventional wireless charging modules or wired charging connection circuits.

[0072] The control button 14 allows for manual control of the fan 6, power source 10, and cooling fins 5, providing greater flexibility in operation.

[0073] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions 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 one or more embodiments or examples.

[0074] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A heat dissipation device for a rail transit electrical cabinet, characterized in that, It includes an air inlet, air outlet, air duct, filter, multiple cooling fins, and fan; Both the air inlet and the air outlet are located on the outer wall of the electrical cabinet, and the air outlet is equipped with a one-way valve that leads to the outside of the electrical cabinet. One end of the air duct is connected to the air inlet, and the other end faces the electrical equipment inside the electrical cabinet; The filter screen is located at the air inlet and is detachably connected to the outer wall of the electrical cabinet; The cooling fins are installed on the inner walls of both sides of the air duct, and adjacent cooling fins are arranged in a staggered manner. The fan is located at the end of the air duct away from the air inlet.

2. The rail transit electrical cabinet heat dissipation device of claim 1, wherein, It also includes a guiding mechanism, which comprises two guide plates, a complete gear, an incomplete gear, and a power source; The end of the air duct that is not connected to the air inlet faces the middle of the electrical cabinet. One end of each of the two guide plates is rotatably mounted on the upper and lower side walls of the end of the air duct facing the middle of the electrical cabinet. The two guide plates are arranged in parallel. The complete gear is fixedly connected to the rotating shaft of the guide plate, and the incomplete gear can mesh with the complete gear; The power source is connected to the central shaft of the incomplete gear and is used to control the incomplete gear to rotate in the opposite direction.

3. The rail transit electrical cabinet heat dissipation device of claim 2, wherein, It also includes a temperature sensor, a temperature comparator, and a display module; The temperature sensor is installed on the inner wall of the electrical cabinet. The output terminal of the temperature sensor is connected to the first input terminal of the temperature comparator. The second input terminal of the temperature comparator is connected to a temperature threshold memory. The output terminal of the temperature comparator is connected to the control terminal of the fan, power source, and cooling plate. The display module is located in the control room where the staff are located, and the input terminal of the display module is connected to the output terminal of the temperature comparator.

4. The rail transit electrical cabinet heat dissipation device of claim 1, wherein, It also includes an extension branch pipe, one end of which is connected to the side wall of the air duct, and the other end is located on the side of the equipment that is prone to overheating inside the electrical cabinet and faces the equipment.

5. The heat dissipation device for rail transit electrical cabinet according to claim 1, wherein, The air duct is made of a multi-section bent pipe, and the pipe is made of a heat-conducting material; The air duct is located on the side of the electrical cabinet where the equipment prone to overheating is located.

6. The rail transit electrical cabinet heat dissipation device of claim 3, wherein, It also includes multiple control buttons, which are installed on the outer wall of the electrical cabinet or in the control room where the staff is located. The output terminals of the control buttons are respectively connected to the control terminals of the fan, power source, and cooling plate.

7. The heat dissipation device for rail transit electrical cabinet according to claim 1, wherein, The filter screen is a magnetic filter screen, which is magnetically connected to the outer wall of the electrical cabinet.

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