A PLC control cabinet with dust-proof structure for tunnels

Abstract

This invention relates to the field of control cabinet technology, and more particularly to a PLC control cabinet with a dustproof structure for use in tunnels. It includes: a cabinet body; a switch door rotatably connected to the cabinet body, the switch door being fixedly connected to a sealing strip for maintaining the cabinet body's seal, and electronic components housed inside the cabinet body; a first vent shell fixedly connected to the cabinet body, the first vent shell being fixedly connected to and connected to a corrugated pipe; a second vent shell fixedly connected to the cabinet body and connected to the first vent shell; and symmetrical ventilation shells, each fixedly connected to and connected to the cabinet body, each symmetrical ventilation shell being slidably connected to a sliding shell. This invention monitors the status of the exhaust fans in real time. When an exhaust fan stops rotating, it automatically switches to a backup cooling channel, ensuring that the backup cooling channel can effectively cool the electronic components inside the PLC control cabinet, while allowing the remaining exhaust fans to continue cooling the electronic components.

Description

Technical Field

[0001] This invention relates to the field of control cabinet technology, and in particular to a PLC control cabinet with a dustproof structure for use in tunnels. Background Technology

[0002] A PLC control cabinet is an advanced programmable control cabinet specifically designed for the precise control of the on / off operation of electrical equipment. In tunnel environments, PLC control cabinets play a crucial role. They can not only intelligently adjust the lighting system to ensure suitable lighting within the tunnel, but also effectively control the ventilation system to maintain air quality and temperature within the tunnel. Furthermore, PLC control cabinets can monitor traffic flow in real time through vehicle detection devices, ensuring smooth and safe traffic within the tunnel. These functions collectively enhance tunnel safety, providing drivers and passengers with a more comfortable and reliable travel experience.

[0003] During the use of existing PLC control cabinets, the electronic components inside generate heat when they are working. If this heat is not dissipated in time, it will cause the temperature inside the cabinet to rise, which will affect the performance and lifespan of the equipment. Therefore, existing PLC control cabinets usually have exhaust fans installed on the top and bottom to maintain air circulation inside. By operating the exhaust fans, cool air from the outside can be drawn into the cabinet and heat can be expelled, achieving air circulation inside the cabinet and effective cooling and heat dissipation of electronic components.

[0004] However, if one of the exhaust fans stops rotating due to equipment malfunction, it will not be able to provide effective ventilation, and the cooling efficiency for electronic components will be greatly reduced. Electronic components will have their lifespan affected if they are exposed to high-temperature environments for a long time. Summary of the Invention

[0005] To address the problems mentioned in the background section, the present invention provides a PLC control cabinet with a dustproof structure for use in tunnels.

[0006] The technical solution of this invention is: a PLC control cabinet with a dustproof structure for tunnels, comprising:

[0007] Cabinet;

[0008] A switch door is rotatably connected to the cabinet body. The switch door is fixed with a sealing strip to keep the cabinet body sealed. Electronic components are placed inside the cabinet body.

[0009] The first vent shell is fixedly connected to the cabinet body, and the first vent shell is fixedly connected to and connected to a corrugated pipe that passes through and is fixedly connected to the switch door.

[0010] The second vent shell is fixed to the cabinet body and communicates with the first vent shell.

[0011] Symmetrical ventilation shells are all fixedly connected to and connected to the cabinet body. Each of the symmetrical ventilation shells is slidably connected to a sliding shell. One of the sliding shells is slidably connected to the second ventilation shell, and the other sliding shell is slidably connected to the first ventilation shell. The second ventilation shell, the first ventilation shell, and the symmetrical ventilation shells are all fixedly connected to a filter element. A driving element is provided inside the sliding shell.

[0012] An air-guiding assembly, disposed within the sliding housing, is used to guide the airflow;

[0013] A control component, located within the cabinet, is used to control the movement of all the sliding shells.

[0014] Further explanation: The air intake assembly includes:

[0015] A rotating shell is fixed to the drive shaft of the drive component. The rotating shell is rotatably connected to a ring-shaped array of swing blades. By changing the swing angle of the swing blades, the wind force can be controlled.

[0016] Furthermore, the air intake assembly also includes:

[0017] The L-shaped frames arranged in a ring array are all slidably connected to the rotating shell. The swing blades are provided with spaced inclined grooves. The L-shaped frames are fixed with spaced fixing pins. The fixing pins on the L-shaped frames slide in adjacent inclined grooves in adjacent swing blades.

[0018] The counterweights, in the same number as the L-shaped frames on the rotating shell, are fixedly connected to the L-shaped frames arranged in a circular array. The counterweights are slidably connected to the rotating shell. A spring rod is fixedly connected inside the swing blade. The telescopic end of the spring rod is rotatably connected to the adjacent L-shaped frame.

[0019] To further explain, the rotating shell is slidably connected to a sliding frame, and the sliding frame is hinged to a number of hinge rods that are the same as the number of counterweights on the adjacent rotating shells. The hinge rods are hinged to the adjacent counterweights.

[0020] To further explain, the control component includes:

[0021] An electric push rod is fixedly connected to the first vent housing;

[0022] The U-shaped frame is slidably connected to the cabinet body. The telescopic end of the electric push rod is fixedly connected to the U-shaped frame. The symmetrical sliding shells are all fixedly connected to the U-shaped frame. The rotating shell and the sliding shell are both equipped with a speed sensor.

[0023] A flow guiding component is disposed on the first vent housing and is used to guide the gas inside the first vent housing.

[0024] To further explain, the flow guiding component includes:

[0025] The first air guide shell is fixedly connected to and communicates with the first ventilation shell;

[0026] An air guide block is fixedly connected to the inner side of the first ventilation shell. The air guide block is fixedly connected to the first air guide shell and is provided with a connecting hole.

[0027] To further explain, the first air guide shell is composed of interconnected parallelogram cavities, rectangular cavities, and arc-shaped cavities. The arc-shaped cavity inside the first air guide shell is connected to the first vent shell. The rectangular cavity of the first air guide shell is located between the parallelogram cavity and the arc-shaped cavity. The first air guide shell is fixedly connected to and connected to an air outlet pipe. The air outlet pipe on the first air guide shell is connected to the parallelogram cavity inside it. The arc-shaped cavity inside the first air guide shell is located on one side of the first vent shell facing downwards. The air guide block is located at the arc-shaped cavity inside the first air guide shell.

[0028] Furthermore, the flow guiding component also includes:

[0029] A vent housing is fixedly connected to and communicates with the first vent housing. The vent housing is located above the first air guide housing. The vent housing is provided with a through hole. The side of the vent housing inside the first vent housing faces upward. Two trapezoidal blocks are fixedly connected inside the first vent housing. The side of the vent housing inside the first vent housing is located between the two trapezoidal blocks inside the first vent housing. The vent housing passes through and is fixedly connected to the adjacent trapezoidal blocks inside the first vent housing.

[0030] Further explanation includes:

[0031] The second air guide shell is fixedly connected to the switch door. One side of the second air guide shell is the air inlet, and the other side is the air outlet. The corrugated pipe is fixedly connected to and communicates with the second air guide shell.

[0032] To further explain, the corrugated pipe is fixedly connected to and communicates with a bend located inside the second air guide shell, and the side of the bend of the corrugated pipe inside the second air guide shell faces the air outlet of the second air guide shell. A fixing ring is fixedly connected to the middle of the second air guide shell, and the cross-section of the fixing ring of the second air guide shell is trapezoidal. The bend of the corrugated pipe is located inside the fixing ring in the middle of the second air guide shell.

[0033] Compared with the prior art, the beneficial effects of this invention are as follows: This invention aims to solve the problem that the exhaust fans used for air circulation in existing PLC control cabinets stop rotating due to equipment malfunction, resulting in the inability to effectively cool electronic components. Specifically, this invention monitors the status of the exhaust fans in real time. When an exhaust fan stops rotating, it automatically switches to the backup cooling channel to ensure that the backup cooling channel can focus on cooling the electronic components in the PLC control cabinet. At the same time, the remaining exhaust fans continue to complete the task of cooling the electronic components. During the cooling process in the PLC control cabinet, the combination of sealing strips and filters achieves dust prevention in the PLC control cabinet.

[0034] This invention modifies the structure of the exhaust fan when focusing on cooling electronic components, so that the blades of the exhaust fan can remain vertical when they stop rotating, reducing obstruction of the air inlet or outlet of the PLC control cabinet, thereby improving air circulation efficiency.

[0035] When performing emergency cooling of electronic components, a direct blowing method is used, which allows the cooling gas to be blown directly onto the electronic components. This lowers the temperature of the electronic components and blows the hot air around them upwards, reducing the time that the hot air remains around the electronic components and thus enhancing the cooling efficiency. In addition, a negative pressure extraction method is used to actively extract the hot air from the top of the electronic components, further shortening the time that the hot air remains around the electronic components.

[0036] When gas is discharged from the bellows, it comes into contact with the outside natural wind through the second air guide shell, which achieves the effect of actively drawing gas out of the bellows, allowing the gas in the bellows to be discharged more quickly. Attached Figure Description

[0037] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0038] Figure 2 This is a three-dimensional structural diagram of the opening and closing door of the present invention;

[0039] Figure 3 This is a three-dimensional sectional view of the cabinet body of the present invention;

[0040] Figure 4 This is a three-dimensional structural cross-sectional view of the first vent shell of the present invention;

[0041] Figure 5 This is a three-dimensional structural cross-sectional view of the second vent shell of the present invention;

[0042] Figure 6 This is a three-dimensional structural cross-sectional view of the sliding shell of the present invention;

[0043] Figure 7 This is a three-dimensional structural cross-sectional view of the rotating shell of the present invention;

[0044] Figure 8 This is a three-dimensional structural cross-sectional view of the oscillating blade of the present invention;

[0045] Figure 9 This is a three-dimensional structural diagram of the first and second vent shells of the present invention;

[0046] Figure 10 This is a three-dimensional structural cross-sectional view of the first vent shell of the present invention;

[0047] Figure 11 This is a three-dimensional structural cross-sectional view of the first air guide shell of the present invention;

[0048] Figure 12 This is a three-dimensional structural cross-sectional view of the second air guide shell of the present invention.

[0049] In the attached diagrams: 10-cabinet, 11-opening / closing door, 12-electronic components, 13-first vent housing, 131-corrugated pipe, 14-second vent housing, 15-ventilation housing, 16-sliding housing, 17-filter, 18-drive component, 20-rotating housing, 21-oscillating blade, 30-L-shaped frame, 31-counterweight, 32-spring rod, 40-sliding frame, 41-hinged rod, 50-speed sensor, 60-electric push rod, 61-U-shaped frame, 70-first air guide housing, 71-air guide block, 72-exhaust housing, 80-second air guide housing. Detailed Implementation

[0050] The preferred technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

[0051] This invention aims to solve the problem that exhaust fans used for air circulation in existing PLC control cabinets stop rotating due to equipment malfunction, thus failing to effectively cool electronic components. Specifically, this invention monitors the status of exhaust fans in real time. When an exhaust fan stops rotating, it automatically switches to a backup cooling channel, enabling the backup cooling channel to focus on cooling the electronic components in the PLC control cabinet, while ensuring that the remaining exhaust fans continue to complete the cooling task for the electronic components.

[0052] Example 1: A PLC control cabinet with a dustproof structure for tunnel applications, such as... Figure 1-Figure 5 and Figure 9As shown, it includes: a cabinet 10; a switch door 11, rotatably connected to the cabinet 10, the switch door 11 being fixedly connected to a sealing strip for keeping the cabinet 10 sealed, and electronic components 12 placed inside the cabinet 10; a first vent housing 13, fixedly connected to the cabinet 10, the first vent housing 13 being fixedly connected to and connected to a corrugated pipe 131 passing through and fixedly connected to the switch door 11; a second vent housing 14, fixedly connected to the cabinet 10 and connected to the first vent housing 13; and symmetrical ventilation housings 15, each fixedly connected to and connected to the cabinet 10. Each of the symmetrical ventilation shells 15 is slidably connected to a sliding shell 16. One sliding shell 16 is slidably connected to the second ventilation shell 14, and the other sliding shell 16 is slidably connected to the first ventilation shell 13. The second ventilation shell 14, the first ventilation shell 13, and the symmetrical ventilation shells 15 are all fixedly connected to a filter element 17. A drive element 18 is provided inside the sliding shell 16. An air-guiding assembly is provided inside the sliding shell 16 for guiding the air. A control assembly is provided inside the cabinet 10 for controlling the movement of all sliding shells 16.

[0053] In the above scheme, the sealing strip between the switch door 11 and the cabinet 10 is used to prevent insects from entering both. The sealing strip and the filter 17 work together to achieve dust prevention inside the cabinet 10. The electronic component 12 is used to control the opening and closing of the electrical equipment in the tunnel. The first ventilation shell 13 is fixed to the lower side inside the cabinet 10 by two bolt seats. The second ventilation shell 14 is fixed to the upper side inside the cabinet 10. The lower side inside the second ventilation shell 14 is provided with an inclined surface to guide the gas flowing through the first ventilation shell 13. The two symmetrical ventilation shells 15 are used to provide daily ventilation inside the cabinet 10. The filter 17 is a filter screen, and the drive component 18 is a single-axis drive motor.

[0054] like Figures 5-8 As shown, the wind-inducing assembly includes: a rotating shell 20, which is fixed to the drive shaft of the drive component 18. The rotating shell 20 is rotatably connected to a ring-shaped array of swing blades 21. By changing the swing angle of the swing blades 21, the wind force can be controlled.

[0055] In the above scheme, when the swing blade 21 is in a vertical state, the area of ​​obstruction to the ventilation shell 15 is reduced. When the swing blade 21 is in an inclined state, the swing blade 21 and the rotating shell 20 rotate, thereby realizing the extraction of gas.

[0056] like Figure 7 and Figure 8As shown, the air-expelling assembly also includes: L-shaped frames 30 arranged in a ring array, all slidably connected to the rotating shell 20; inclined grooves arranged at intervals are provided in the swing blades 21; fixed pins are fixedly connected to the L-shaped frames 30 at intervals; the fixed pins on the L-shaped frames 30 slide in adjacent inclined grooves in adjacent swing blades 21; counterweights 31, the number of which is the same as the number of L-shaped frames 30 on the rotating shell 20, are fixedly connected to the L-shaped frames 30 arranged in a ring array, and the counterweights 31 are slidably connected to the rotating shell 20; spring rods 32 are fixedly connected to the swing blades 21; the telescopic end of the spring rods 32 is limited and rotatably connected to the adjacent L-shaped frames 30; a sliding frame 40 is slidably connected to the rotating shell 20; the sliding frame 40 is hinged to a hinge rod 41 with the same number of counterweights 31 as the adjacent rotating shell 20; the hinge rod 41 is hinged to the adjacent counterweight 31.

[0057] In the above scheme, when the fixing pin on the L-shaped frame 30 is located on the side of the adjacent inclined groove in the adjacent swing blade 21 away from the adjacent rotating shell 20, the swing blade 21 is in an inclined state. When the fixing pin on the L-shaped frame 30 is located on the side of the adjacent inclined groove in the adjacent swing blade 21 close to the adjacent rotating shell 20, the swing blade 21 is in a vertical state. The state switching of the swing blade 21 is realized through the cooperation between the fixing pin on the L-shaped frame 30 and the inclined groove in the swing blade 21.

[0058] like Figures 4-6 and Figure 9 As shown, the control components include: an electric push rod 60, fixedly connected to the first vent housing 13; a U-shaped frame 61, slidably connected to the cabinet 10, with the telescopic end of the electric push rod 60 fixedly connected to the U-shaped frame 61, and symmetrical sliding shells 16 all fixedly connected to the U-shaped frame 61, and a speed sensor 50 jointly provided on the rotating shell 20 and the sliding shell 16; and a flow guiding component, disposed on the first vent housing 13, for guiding the gas inside the first vent housing 13.

[0059] In the above scheme, the U-shaped frame 61 drives the symmetrical sliding shell 16 to move, so as to switch the cooling mode inside the cabinet 10. The speed sensor 50 consists of a gear ring to be measured and a sensor. The sensor is fixedly connected to the adjacent sliding shell 16, and the gear ring to be measured is fixedly connected to the adjacent rotating shell 20.

[0060] like Figure 3 , Figure 4 , Figure 10 and Figure 11As shown, the airflow guiding assembly includes: a first air guide shell 70, which is fixedly connected to and connected to a first vent shell 13; an air guide block 71, which is fixedly connected to the inner side of the first vent shell 13, and the air guide block 71 is fixedly connected to the first air guide shell 70. The air guide block 71 is provided with a connecting hole. The first air guide shell 70 is composed of parallelogram cavities, rectangular cavities and arc-shaped cavities that are interconnected. The arc-shaped cavity in the first air guide shell 70 is connected to the first vent shell 13. The rectangular cavity in the first air guide shell 70 is located between the parallelogram cavity and the arc-shaped cavity. The first air guide shell 70 is fixedly connected to and connected to an air outlet pipe. The air outlet pipe on the first air guide shell 70 is connected to the parallelogram cavity inside it. The arc-shaped cavity in the first air guide shell 70 is located on one side inside the first vent shell 13 facing downward. The air guide block 71 is located in the arc-shaped cavity inside the first air guide shell 70.

[0061] In the above scheme, the connecting hole on the air guide block 71 is used to increase the moving speed of the gas flowing through the air guide block 71, so that the gas can be discharged quickly. The electronic component 12 consists of a processor and a switch. However, in this invention, there are two electronic components 12. The first air guide shell 70 is located directly below the processor inside the electronic component 12.

[0062] like Figure 10 As shown, the airflow guiding assembly also includes: an exhaust shell 72, which is fixedly connected to and communicates with the first ventilation shell 13. The exhaust shell 72 is located above the first air guide shell 70. The exhaust shell 72 is provided with a through hole. The side of the exhaust shell 72 inside the first ventilation shell 13 faces upward. Two trapezoidal blocks are fixedly connected inside the first ventilation shell 13. The side of the exhaust shell 72 inside the first ventilation shell 13 is located between the two trapezoidal blocks inside the first ventilation shell 13. The exhaust shell 72 passes through the adjacent trapezoidal block inside the first ventilation shell 13 and is fixedly connected to it.

[0063] In the above scheme, the exhaust shell 72 is composed of a rectangular shell and a triangular shell fixed to each other. The triangular shell inside the exhaust shell 72 is located inside the first ventilation shell 13. The triangular shell of the exhaust shell 72 is located between two trapezoidal blocks inside the first ventilation shell 13, and the outlet of the triangular shell inside the exhaust shell 72 faces the upper side inside the first ventilation shell 13. When the gas flows through the first ventilation shell 13, it creates a negative pressure around the exhaust shell 72 at the top of the first ventilation shell 13, thereby producing a negative pressure suction effect. The exhaust shell 72 is located directly above the processor inside the electronic component 12.

[0064] When it is necessary to control the electrical equipment in the tunnel through the cabinet 10, the staff closes the switch door 11 so that the sealing strip on the switch door 11 contacts the cabinet 10, thereby achieving a seal inside the cabinet 10. After the cabinet 10 is sealed, the electrical equipment in the tunnel can be controlled through the electronic components 12.

[0065] As the electronic component 12 operates, it generates heat. At this time, the operator controls the telescopic part of the electric push rod 60 to retract, causing the telescopic part of the electric push rod 60 to drive the two sliding shells 16 to move forward through the U-shaped frame 61, so that the two sliding shells 16 slide between the two ventilation shells 15 respectively. At this time, the telescopic part of the electric push rod 60 stops moving.

[0066] Both sliding shells 16 are located between two ventilation shells 15. The ventilation shells 15 are then connected to the adjacent sliding shells 16. Then, the operator starts the two drive components 18. The drive components 18 drive the rotating shell 20 and its auxiliary parts on their drive shaft to rotate. During the rotation of the rotating shell 20, the measured gear ring in the speed sensor 50 is rotated. The sensor in the speed sensor 50 remains stationary. By rotating the rotating shell 20 to drive the rotation of the measured gear ring in the speed sensor 50, the measured gear ring in the speed sensor 50 and the sensor in the speed sensor 50 are synchronized, thereby realizing the monitoring of the rotation speed of the rotating shell 20.

[0067] Taking the movement of one of the counterweights 31 inside the rotating shell 20 as an example, when the rotating shell 20 rotates, the centrifugal force generated causes the counterweight 31 to overcome the supporting force of the adjacent spring rod 32. The counterweight 31 then drives the adjacent L-shaped frame 30 to move outward along the rotating shell 20 and presses the telescopic part of the adjacent spring rod 32. (During the movement of the counterweight 31, the adjacent sliding frame 40 moves downward through the adjacent hinge rod 41, so that the remaining hinge rod 41 drives the adjacent counterweight 31 to move, realizing the simultaneous movement of all counterweights 31 and avoiding eccentric rotation inside the rotating shell 20.) During the movement of the L-shaped frame 30, the fixed pin on it presses the adjacent inclined groove inside the swing blade 21, causing the swing blade 21 to swing and gradually tilt, thereby generating a suction force on the gas.

[0068] During the rotation of the lower rotating shell 20, all the swing blades 21 on it rotate, causing the outside air to pass through the filter 17 and ventilation shell 15 on the lower front side, thereby drawing the outside air into the cabinet 10. During the rotation of the upper rotating shell 20, all the swing blades 21 on it rotate, causing the air in the cabinet 10 to pass through the ventilation shell 15 and be discharged. Through the above operation steps, the air circulation in the cabinet 10 is realized.

[0069] When the drive shaft stops rotating due to a malfunction of the drive component 18 located on the upper side (the drive component 18 is damaged), the rotation speed of the rotating housing 20 located on the upper side gradually decreases. At this time, the speed sensor 50 transmits the signal to the electric push rod 60, which drives the U-shaped frame 61 to move to the rear side. This causes the U-shaped frame 61 to move the two sliding housings 16 to contact the upper side of the second vent housing 14 and the lower side of the first vent housing 13, respectively, so as to realize the replacement of the ventilation channel.

[0070] After the rotational speed of the upper rotating shell 20 decreases, the spring rod 32 drives the adjacent L-shaped frame 30 to reset and move. During the movement of the L-shaped frame 30, the fixed pin on it presses against the inclined groove in the adjacent swing blade 21, causing the swing blade 21 to reset and swing. During the movement of the L-shaped frame 30, the counterweight block 31 drives the adjacent hinge rod 41 to reset. Through the cooperation of the hinge rod 41 and the adjacent sliding frame 40, all the counterweight blocks 31 in the rotating shell 20 can reset and move simultaneously. When the drive shaft of the upper driving member 18 completely stops rotating, the upper rotating shell 20 stops rotating, and the state of the parts in the rotating shell 20 can be referenced. Figure 6 and Figure 7 By changing the aforementioned components, the ventilation duct can be switched.

[0071] During rotation, the rotating shell 20 on the lower side and the swing blades 21 on it draw outside gas into the first vent shell 13 through the rear filter 17. The first vent shell 13 guides the gas. When the gas passes through the two first air guide shells 70, some of the gas continues to move upward between the two first air guide shells 70, while the other part of the gas enters the two first air guide shells 70. When the gas enters the arc-shaped cavity inside the first air guide shell 70, part of the gas that enters the arc-shaped cavity inside the first air guide shell 70 enters the rectangular cavity of the first air guide shell 70, and then enters the parallelogram cavity inside the first air guide shell 70, and is then discharged through the air outlet pipe on the first air guide shell 70. When the air outlet pipe on the first air guide shell 70 exhausts gas, it directly blows the electronic component 12 to cool it down, focusing on reducing the temperature around the electronic component 12. The gas discharged through the air outlet pipe on the first air guide shell 70 blows the hot gas emitted by the electronic component 12 upward, increasing the upward flow speed of the hot gas and enhancing the cooling efficiency of the electronic component 12.

[0072] Another portion of the gas inside the arc-shaped cavity of the first air guide shell 70 is guided by the connecting hole inside the air guide block 71. When it is ejected from the connecting hole inside the air guide block 71, the speed of gas outflow is accelerated, thereby increasing the flow rate of gas inside the first ventilation shell 13. The gas moving upward between the two first air guide shells 70 then passes through the two exhaust shells 72, and then enters the bellows 131, and is ejected from the bellows 131.

[0073] When the gas passes through the exhaust housing 72, it creates a negative pressure inside the exhaust housing 72 (according to the Bernoulli effect, when the gas flows between the two trapezoidal blocks in the upper part of the first ventilation housing 13, the flow area decreases, increasing the gas flow rate, thereby reducing the pressure at this point, thus achieving the effect of negative pressure extraction). This allows the gas around the exhaust housing 72 to enter through the through holes on the exhaust housing 72, thereby achieving active extraction of the gas on the upper side of the electronic component 12, further reducing the residence time of hot gas around the electronic component 12. Through the above steps, emergency treatment inside the cabinet 10 is achieved.

[0074] Once the rotation speed of the lower rotating shell 20 decreases, the switching steps described above can be repeated. The difference is that the output shaft of the upper driving member 18 rotates in the opposite direction, so that the gas enters the second ventilation shell 14 through the upper rear filter 17, and then enters the first ventilation shell 13 through the second ventilation shell 14. The subsequent steps and effects are the same as described above.

[0075] Once staff notice the abnormality inside cabinet 10, they can go to the site to replace the damaged parts and restore the ventilation system to the two ventilation shells 15.

[0076] Example 2: Based on Example 1, such as Figure 2 and Figure 12 As shown, it also includes: a second air guide shell 80, fixedly connected to the switch door 11, one side of the second air guide shell 80 is an air inlet, the other side of the second air guide shell 80 is an air outlet, a corrugated pipe 131 is fixedly connected to and communicates with the second air guide shell 80, the corrugated pipe 131 is fixedly connected to and communicates with a bend located inside the second air guide shell 80, and the side of the bend of the corrugated pipe 131 located inside the second air guide shell 80 faces the air outlet of the second air guide shell 80, a fixing ring is fixedly connected to the middle of the second air guide shell 80, the cross section of the fixing ring of the second air guide shell 80 is trapezoidal, and the bend of the corrugated pipe 131 is located inside the fixing ring in the middle of the second air guide shell 80.

[0077] In the above scheme, when using the present invention to control the opening or closing of electrical equipment in the tunnel, the staff places the cabinet 10 in an embedded manner (existing placement method) in the tunnel. During the placement process, the second air guide shell 80 is exposed in the tunnel. Existing tunnels usually have ventilation equipment installed, and the ventilation direction of the ventilation equipment is consistent with the driving direction of the car. Therefore, the air inlet of the second air guide shell 80 corresponds to the air inlet of the tunnel, and the air outlet of the second air guide shell 80 corresponds to the air outlet of the tunnel.

[0078] Working principle: The gas discharged through the bellows 131 enters the second air guide shell 80. The gas in the tunnel enters the second air guide shell 80 from the left side and is ejected from the right side. When the airflow passes through the second air guide shell 80, it creates negative pressure extraction in the bellows 131 (according to the Bernoulli effect, when the gas flows through the arc-shaped ring in the middle of the second air guide shell 80, the cross-section of the fixed ring in the middle of the second air guide shell 80 is trapezoidal, which reduces the flow area of ​​the gas and increases the flow velocity, thereby reducing the pressure at this point and achieving the effect of negative pressure extraction). This accelerates the speed at which the gas flows out of the bellows 131, thereby enhancing the cooling efficiency. When the gas is discharged through the bend on the bellows 131, it is directly ejected from the air outlet of the second air guide shell 80, avoiding the entry of impurities carried by the second air guide shell 80 into the bellows 131 when the gas is discharged.

[0079] By using the second air guide shell 80 to assist in the exhaust of gas from the cabinet 10 and the emergency cooling of the electronic components 12 mentioned in Example 1, a stable gas flow is maintained inside the cabinet 10, ensuring the normal operation of the electrical components inside the cabinet 10.

[0080] Those skilled in the art should understand that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A PLC control cabinet with a dustproof structure for use in tunnels, comprising: Cabinet (10); A switch door (11) is rotatably connected to the cabinet (10). The switch door (11) is fixedly connected to a sealing strip for keeping the cabinet (10) sealed. Electronic components (12) are placed inside the cabinet (10). The cabinet is characterized by further comprising: The first ventilation shell (13) is fixed inside the cabinet (10). The first ventilation shell (13) is fixedly connected to and communicates with a corrugated pipe (131) that passes through and is fixedly connected to the switch door (11). The second vent shell (14) is fixed inside the cabinet (10) and communicates with the first vent shell (13); Symmetrical ventilation shells (15) are all fixedly connected to and connected to the cabinet (10). Each of the symmetrical ventilation shells (15) is slidably connected to a sliding shell (16). One of the sliding shells (16) is slidably connected to the second ventilation shell (14), and the other sliding shell (16) is slidably connected to the first ventilation shell (13). The second ventilation shell (14), the first ventilation shell (13), and the symmetrical ventilation shells (15) are all fixedly connected to a filter element (17). A driving element (18) is provided inside the sliding shell (16). An air-guiding assembly, disposed within the sliding shell (16), is used to guide the airflow; A control component, located within the cabinet (10), is used to control the movement of all the sliding shells (16).

2. A PLC control cabinet with a dustproof structure for tunnels according to claim 1, characterized in that, The air intake assembly includes: The rotating shell (20) is fixed to the drive shaft of the drive component (18). The rotating shell (20) is rotatably connected to the swing blades (21) arranged in a ring array. By changing the swing angle of the swing blades (21), the wind force can be controlled.

3. A PLC control cabinet with a dustproof structure for tunnels according to claim 2, characterized in that, The air intake assembly also includes: The L-shaped frames (30) arranged in a ring array are all slidably connected to the rotating shell (20). The swing blades (21) are provided with spaced inclined grooves. The L-shaped frames (30) are fixed with spaced fixed pins. The fixed pins on the L-shaped frames (30) slide in adjacent inclined grooves in adjacent swing blades (21). The number of counterweights (31) is the same as the number of L-shaped frames (30) on the rotating shell (20), and they are respectively fixed to the L-shaped frames (30) distributed in a ring array. The counterweights (31) are slidably connected to the rotating shell (20). A spring rod (32) is fixedly connected inside the swing blade (21). The telescopic end of the spring rod (32) is limited and rotatedly connected to the adjacent L-shaped frame (30).

4. A PLC control cabinet with a dustproof structure for tunnels according to claim 3, characterized in that: The rotating shell (20) is slidably connected to a sliding frame (40), and the sliding frame (40) is hinged to a number of hinge rods (41) that are the same as the number of counterweights (31) on the adjacent rotating shell (20). The hinge rods (41) are hinged to the adjacent counterweights (31).

5. A PLC control cabinet with a dustproof structure for tunnels according to claim 4, characterized in that, The control component includes: An electric push rod (60) is fixedly connected to the first vent housing (13); The U-shaped frame (61) is slidably connected to the cabinet (10). The telescopic end of the electric push rod (60) is fixedly connected to the U-shaped frame (61). The symmetrical sliding shells (16) are all fixedly connected to the U-shaped frame (61). The rotating shell (20) and the sliding shell (16) are both equipped with a speed sensor (50). A flow guiding component is disposed on the first vent housing (13) for guiding the gas inside the first vent housing (13).

6. A PLC control cabinet with a dustproof structure for tunnels according to claim 5, characterized in that, The flow guiding component includes: The first air guide shell (70) is fixedly connected to and connected to the first ventilation shell (13). The air guide block (71) is fixedly connected to the inner side of the first ventilation shell (13). The air guide block (71) is fixedly connected to the first air guide shell (70). The air guide block (71) is provided with a connecting hole.

7. A PLC control cabinet with a dustproof structure for tunnels according to claim 6, characterized in that, The first air guide shell (70) is composed of interconnected parallelogram cavity, rectangular cavity and arc cavity. The arc cavity in the first air guide shell (70) is connected to the first ventilation shell (13). The rectangular cavity of the first air guide shell (70) is located between the parallelogram cavity and the arc cavity. The first air guide shell (70) is fixedly connected to and connected to an air outlet pipe. The air outlet pipe on the first air guide shell (70) is connected to the parallelogram cavity inside it. The arc cavity in the first air guide shell (70) is located on one side of the first ventilation shell (13) facing downward. The air guide block (71) is located in the arc cavity inside the first air guide shell (70).

8. A PLC control cabinet with a dustproof structure for tunnels according to claim 6, characterized in that, The flow guiding component also includes: A vent housing (72) is fixedly connected to and connected to the first ventilation housing (13). The vent housing (72) is located above the first air guide housing (70). The vent housing (72) is provided with a through hole. The side of the vent housing (72) inside the first ventilation housing (13) faces upward. Two trapezoidal blocks are fixedly connected inside the first ventilation housing (13). The side of the vent housing (72) inside the first ventilation housing (13) is located between the two trapezoidal blocks inside the first ventilation housing (13). The vent housing (72) passes through the adjacent trapezoidal blocks inside the first ventilation housing (13) and is fixedly connected to them.

9. A PLC control cabinet with a dustproof structure for tunnels according to claim 1, characterized in that it further... include: The second air guide shell (80) is fixedly connected to the switch door (11). One side of the second air guide shell (80) is the air inlet and the other side is the air outlet. The corrugated pipe (131) is fixedly connected to and communicates with the second air guide shell (80).

10. A PLC control cabinet with a dustproof structure for tunnels according to claim 9, characterized in that: The corrugated pipe (131) is fixedly connected to and connected to a bend located inside the second air guide shell (80), and the bend of the corrugated pipe (131) is located on the side inside the second air guide shell (80) facing the air outlet of the second air guide shell (80). A fixing ring is fixedly connected to the middle of the second air guide shell (80), and the cross section of the fixing ring of the second air guide shell (80) is trapezoidal. The bend of the corrugated pipe (131) is located inside the fixing ring in the middle of the second air guide shell (80).

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