Rail transit vehicle and under-vehicle electrical box thereof

Abstract

The utility model discloses a rail transit vehicle and an under-vehicle electrical box thereof, and relates to the technical field of rail transit, the under-vehicle electrical box is installed under the vehicle, and the under-vehicle electrical box adopts a mode of fusing a direct current cabinet, an alternating current cabinet and a control cabinet on the vehicle and a junction box and a contactor box under the vehicle; the interior of the under-vehicle electrical box is divided into a direct-current area and an alternating-current area, a direct-current device and a direct-current line are arranged in the direct-current area, an alternating-current device and an alternating-current line are arranged in the alternating-current area, and the direct-current area and the alternating-current area are each provided with an independent access door. According to the under-vehicle electrical box, the space in the vehicle is saved, a row of seats can be additionally arranged in the saved space in the vehicle, and the effects of lifting by fixed personnel and reducing the weight of the whole vehicle are achieved.

Description

Technical Field

[0001] The present application relates to the field of rail transit technology, and in particular to a rail transit vehicle and an under-vehicle electrical box thereof. Background Art

[0002] Rail transit vehicles are a type of transportation used in urban rail transit systems and intercity rail transit systems. They provide passengers with an efficient, environmentally friendly and safe mode of transportation.

[0003] With the development of science and technology, hydrogen-powered rail transit vehicles have significant advantages in energy efficiency compared to traditional energy rail transit vehicles, thereby improving the transportation efficiency of rail transit and reducing operating costs. However, even for hydrogen-powered rail transit vehicles, the carrying capacity is still limited by the on-board electrical cabinet technology.

[0004] Existing electrical cabinets are installed inside the vehicle, occupying valuable passenger space, limiting the vehicle's carrying capacity and passenger comfort; they are large in size and weight, increasing the overall weight of the vehicle and affecting energy efficiency and performance; maintenance and inspection become complicated and difficult due to the compact space, increasing maintenance costs; the heat dissipation design is limited in a limited space, which may cause equipment overheating, affecting performance and life; at the same time, the compact layout and high temperature environment may increase the risk of electrical failure and fire, posing a potential threat to passenger safety. Utility Model Content

[0005] The purpose of the present application is to provide an undercarriage electrical box, which saves space inside the vehicle. The saved space inside the vehicle can be used to add a row of seats, thereby increasing the number of passengers and reducing the weight of the entire vehicle. Another purpose of the present application is to provide a rail transit vehicle including an undercarriage electrical box.

[0006] To achieve the above-mentioned purpose, the present application provides an under-vehicle electrical box, which is installed under the vehicle. The under-vehicle electrical box adopts a method of integrating the DC cabinet, AC cabinet and control cabinet on the vehicle, and the junction box and contactor box under the vehicle; the interior of the under-vehicle electrical box is divided into a DC area and an AC area, and the DC area is provided with DC devices and DC lines, and the AC area is provided with AC devices and AC lines, and the DC area and the AC area are both provided with independent maintenance doors.

[0007] In some embodiments, the DC zone and the AC zone are divided in the length direction of the under-vehicle electrical box, the DC zone has a DC zone skirt plate, a DC zone top plate and a pair of DC zone box plates, the DC zone skirt plate and the DC zone top plate are connected between the pair of DC zone box plates, the AC zone has an AC zone skirt plate, an AC zone top plate and a pair of AC zone box plates, the AC zone skirt plate and the AC zone top plate are connected between the pair of AC zone box plates.

[0008] In some embodiments, the DC zone skirt is arranged with a network host and a diode assembly, and the DC zone top plate is arranged with a branch terminal row; and / or,

[0009] The AC zone skirt is provided with AC auxiliary contactors, contactors, relays and knife switches, and the AC zone top is provided with branch terminal blocks; and / or,

[0010] The DC area box panel and the AC area box panel are arranged with connectors and cable duct sealing modules to realize the incoming and outgoing lines of the DC area and the AC area.

[0011] In some embodiments, a DC zone separator is disposed inside the under-vehicle electrical box, and the DC zone separator separates the DC zone into two areas in the length direction of the under-vehicle electrical box.

[0012] In some embodiments, a distribution board is disposed inside the under-vehicle electrical box, the distribution board is located in a first area of ​​the DC zone, and the DC zone skirt is located in a second area of ​​the DC zone.

[0013] In some embodiments, the distribution board is vertically arranged and has a double-layer disk structure. The first layer of the disk structure can be pulled out vertically and is used for maintenance when pulled out. The second layer of the disk structure is exposed for maintenance when the first layer of the disk structure is pulled out.

[0014] In some embodiments, a metal partition is disposed inside the under-vehicle electrical box. The metal partition is located at the junction of the DC zone and the AC zone. The metal partition is used to separate the DC zone and the AC zone to avoid line interference.

[0015] In some embodiments, the under-vehicle electrical box is provided with rotatable inspection doors on both sides in the length direction, the inner side of the first inspection door leads to the DC area, and the inner side of the second inspection door leads to the AC area, and the under-vehicle electrical box is provided with a pull-out bottom plate on the bottom side in the height direction.

[0016] In some embodiments, the under-vehicle electrical box is provided with cooling fins on the top side in the height direction, an exhaust fan is provided inside the under-vehicle electrical box, and air inlets and air outlets are provided on both sides of the under-vehicle electrical box in the width direction, a breathing valve is installed on the air inlet, and filter cotton is installed on the air inlet and the air outlet.

[0017] The present application also provides a rail transit vehicle, comprising the above-mentioned under-vehicle electrical box.

[0018] Compared with the above-mentioned background technology, the under-vehicle electrical box provided in the present application is installed under the vehicle. The under-vehicle electrical box adopts a method of integrating the DC cabinet, AC cabinet and control cabinet on the vehicle, as well as the junction box and contactor box under the vehicle; the interior of the under-vehicle electrical box is divided into a DC area and an AC area, and DC devices and DC lines are arranged in the DC area, and AC devices and AC lines are arranged in the AC area, and both the DC area and the AC area are provided with independent maintenance doors.

[0019] The undercarriage electrical box integrates the DC cabinet, AC cabinet and control cabinet on the car, the undercarriage junction box and contactor box into the undercarriage control box (only the circuit breaker panel is left at the end of the car for emergency operation in the mechanic's room). Compared with transferring the electrical cabinet from the car to the undercarriage, the undercarriage space is effectively utilized. This integration solution focuses on solving the problems of tight space and heavy weight in the car, improving the comfort of passengers in the car and the carrying capacity of the vehicle. Because the undercarriage electrical box is installed under the car, the DC area and the AC area are equipped with independent inspection doors, which can simplify the maintenance and inspection process and reduce maintenance costs; at the same time, the method of installing the undercarriage electrical box under the car avoids the heat dissipation design in a limited space, the compact layout and the high temperature environment that may increase the risk of electrical failure and fire, and improves the safety and reliability of rail transit vehicles.

[0020] Combined with the above structure and process description, it can be seen that the under-vehicle electrical box has at least the following beneficial effects: the under-vehicle electrical box saves space inside the vehicle, and the saved space inside the vehicle can add a row of seats, thereby achieving the effect of increasing the number of passengers and reducing the weight of the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0022] Figure 1 The overall structure diagram of the under-vehicle electrical box provided in the embodiment of the present application;

[0023] Figure 2 A structural diagram of an under-vehicle electrical box under a vehicle provided in an embodiment of the present application;

[0024] Figure 3 An internal structural diagram of the under-vehicle electrical box provided in an embodiment of the present application;

[0025] Figure 4 A structural diagram of a switchboard provided in an embodiment of the present application;

[0026] Figure 5A top view of an under-vehicle electrical box provided in an embodiment of the present application;

[0027] Figure 6 A heat dissipation diagram of the under-vehicle electrical box under natural cooling provided by an embodiment of the present application;

[0028] Figure 7 A heat dissipation diagram of the under-vehicle electrical box under forced ventilation provided in an embodiment of the present application;

[0029] Figure 8 for Figure 5 GG cross-sectional view of the lower electrical box of the CRRC.

[0030] in:

[0031] Under-vehicle electrical box 100,

[0032] DC zone 200, DC zone skirt plate 210, DC zone box plate 220,

[0033] AC area 300, AC area skirt board 310, AC area box board 320,

[0034] Switchboard 101 , heat dissipation fins 102 , exhaust fan 103 , air inlet 104 , air outlet 105 , metal partition 106 , DC zone partition 107 , first layer disk structure 1011 , second layer disk structure 1012 . DETAILED DESCRIPTION

[0035] The existing electrical cabinet installed in the car is large in size, heavy in weight, and occupies the end space in the car. The current solution is to compress the space of the electrical cabinet, but this method has the following disadvantages: the compressed space is limited, the space layout is too compact and difficult to construct.

[0036] In response to the defects in the prior art, the present application provides an under-vehicle electrical box, which aims to solve the problems of tight space and weight reduction in the vehicle, so that one row of seats can be added to each car and the weight of the entire vehicle cabinet can be reduced by 5%.

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0039] Please refer to Figure 1 and Figure 2,in, Figure 1 This is the overall structure diagram of the undercar electrical box provided in the embodiment of the present application. Figure 2 This is a structural diagram of the under-vehicle electrical box under the vehicle provided in an embodiment of the present application.

[0040] In the first specific implementation manner, the under-vehicle electrical box 100 provided in the embodiment of the present application is installed under the vehicle, and the under-vehicle electrical box 100 adopts a method of integrating the DC cabinet, AC cabinet and control cabinet on the vehicle, and the junction box and contactor box under the vehicle; the interior of the under-vehicle electrical box 100 is divided into a DC area 200 and an AC area 300, and the DC area 200 is provided with DC devices and DC lines, and the AC area 300 is provided with AC devices and AC lines, and both the DC area 200 and the AC area 300 are provided with independent maintenance doors.

[0041] The undercarriage electrical box 100 integrates the DC cabinet, AC cabinet and control cabinet on the car, the undercarriage junction box and contactor box into the undercarriage control box (only the circuit breaker panel is left at the end inside the car for emergency operation in the mechanic's room). Compared with transferring the electrical cabinet from inside the car to undercarriage, it effectively utilizes the undercarriage space. This integration solution focuses on solving the problems of tight space and heavy weight inside the car, reducing the space occupied by the original electrical cabinet by 90% and reducing the weight by 5%, thereby improving the comfort of passengers inside the car and the carrying capacity of the vehicle. Because the undercarriage electrical box 100 is installed under the car, the DC area 200 and the AC area 300 are both provided with independent inspection doors, which can simplify the maintenance and inspection process and reduce maintenance costs; at the same time, the method of installing the undercarriage electrical box 100 under the car avoids the heat dissipation design in a limited space and the electrical failure and fire risks that may increase due to compact layout and high temperature environment, thereby improving the safety and reliability of rail transit vehicles.

[0042] In combination with the above structure and process description, it can be seen that the under-vehicle electrical box 100 has at least the following beneficial effects: the under-vehicle electrical box 100 saves space inside the vehicle, and the saved space inside the vehicle can be used to add a row of seats, thereby achieving the effect of increasing the number of passengers and reducing the weight of the entire vehicle.

[0043] It should be noted that the core invention of this application lies in the integration of the on-board electrical equipment and the off-board electrical equipment, that is, the original DC cabinet, AC cabinet and control cabinet on the vehicle, as well as the junction box and contactor box under the vehicle are integrated into the off-board control box, thereby obtaining the technical solution of the off-board electrical box. Because the off-board control box adopts the technical means of integrating the on-board DC cabinet, AC cabinet and control cabinet, the off-board junction box and contactor box, it overcomes the problems of tight space and heavy weight in the vehicle, thereby achieving the release of space in the vehicle. The released space can add a row of seats, thereby achieving the effect of increasing the capacity and reducing the weight of the whole vehicle.

[0044] Based on this, the present application partitions the interior of the under-vehicle electrical box, that is, divides the interior of the under-vehicle electrical box 100 into a DC zone 200 and an AC zone 300, so that the AC zone 300 is set on the high-voltage side and the DC zone 200 is set on the low-voltage side. All AC devices and AC lines in the fusion solution are arranged in the AC zone 300, and all DC devices, equipment and DC lines are arranged in the DC zone 200.

[0045] This arrangement clearly partitions the interior of the undercar electrical box, and separates the DC area 200 and the AC area 300, which has many benefits: First, this layout can significantly improve safety, because the AC area 300 is located on the high-voltage side, while the DC area 200 is located on the low-voltage side. Such separation helps reduce the potential risk of high-voltage equipment to low-voltage equipment. Secondly, the partition design optimizes heat dissipation management, allowing for special design and optimization for the different heat dissipation requirements of AC and DC equipment, thereby improving the overall cooling efficiency. In addition, all AC devices and lines are concentrated in the AC area 300, while all DC devices and lines are arranged in the DC area 200, which helps to improve the convenience of maintenance and overhaul, because the staff can operate on specific areas without interfering with other areas, which reduces maintenance time and cost. Finally, partitioning also helps to reduce electromagnetic interference and improve the overall performance and reliability of the system. In this way, the design of the undercar electrical box not only improves safety and maintenance convenience, but also enhances the energy efficiency and operational stability of the vehicle.

[0046] Based on the integration scheme and partition design in the above content, this embodiment has clearly explained the core points of the technical solution, and those skilled in the art are capable of making further detailed settings on this basis. For example, in the undercar electrical box, the original contactor box, DC cabinet, AC cabinet, control cabinet, auxiliary junction box, control junction box, as well as network host, relay, contactor and junction box are adaptively adjusted and set in the undercar electrical box, and this application will not elaborate on this.

[0047] Please refer to Figure 3 , Figure 3 This is a diagram of the internal structure of the under-vehicle electrical box provided in an embodiment of the present application.

[0048] In some embodiments, the DC zone 200 and the AC zone 300 are divided in the length direction of the under-vehicle electrical box 100, the DC zone 200 has a DC zone skirt plate 210, a DC zone top plate and a pair of DC zone box plates 220, the DC zone skirt plate 210 and the DC zone top plate are connected between the pair of DC zone box plates 220, the AC zone 300 has an AC zone skirt plate 310, an AC zone top plate and a pair of AC zone box plates 320, the AC zone skirt plate 310 and the AC zone top plate are connected between the pair of AC zone box plates 320.

[0049] In this embodiment, if Figure 2 and Figure 3 As shown, the DC area 200 is located at the right part of the undercar electrical box 100, and the AC area 300 is located at the left part of the undercar electrical box 100. The DC area 200 and the AC area 300 may be two unequal parts. Figure 3 As can be seen in the figure, the left and right sides of the undercar electrical box are skirts, and the front and rear sides of the undercar electrical box are box boards. This arrangement, on the one hand, provides abundant positions on the undercar electrical box 100, and can provide more space for arranging electrical equipment. On the other hand, electrical equipment will generate more heat, and arranging it on the side is conducive to heat dissipation, and at the same time, the side arrangement is more convenient for maintenance and inspection.

[0050] Please refer to Figure 8 , Figure 8 for Figure 5 GG cross-sectional view of the lower electrical box of the CRRC.

[0051] In some embodiments, a metal partition 106 is disposed inside the undercarriage electrical box 100. The metal partition 106 is located at the junction of the DC area 200 and the AC area 300. The metal partition 106 is used to separate the DC area 200 and the AC area 300 to avoid line interference. In the undercarriage electrical box 100, the metal partition 106 is connected to the box panels on the front and rear sides.

[0052] In this embodiment, in terms of equipment layout, the metal partition 106 provides a physical partition, which effectively avoids line interference between the two areas and improves the stability and reliability of the electrical system. At the same time, the metal partition has excellent electromagnetic compatibility, which can block the electromagnetic interference that may be generated in the AC area and protect the equipment in the DC area from damage, thereby enhancing the anti-interference ability of the entire system. In addition, when an electrical fault occurs, the metal partition 106 can limit the spread of the fault and improve safety. In terms of maintenance and overhaul, the presence of clear partitions and partitions simplifies the workflow, reduces the risk of maintenance personnel contacting live parts, and improves the efficiency and safety of maintenance. In summary, the provision of the metal partition 106 not only optimizes the internal layout of the electrical box, but also enhances the operating performance and safety of the vehicle.

[0053] As an option, considering that the size of the DC zone 200 is larger than that of the AC zone 300, in order to improve the structural strength of the undercar electrical box 100 in the DC zone 200, a DC zone separator 107 is also provided in the DC zone 200. In the undercar electrical box 100, the DC zone separator 107 is connected to the box plates at the front and rear sides.

[0054] In this embodiment, the DC zone 200 is divided into two areas by the DC zone partition plate 107 , which not only improves the overall mechanical performance of the under-vehicle electrical box 100 , but also helps to improve the space utilization of the DC zone 200 .

[0055] Please refer to Figure 4 , Figure 4 This is a structural diagram of the extraction of the distribution board provided in an embodiment of the present application.

[0056] In some embodiments, the under-vehicle electrical box 100 is provided with rotatable inspection doors on both sides in the length direction, the inner side of the first inspection door leads to the DC area 200, and the inner side of the second inspection door leads to the AC area 300. The under-vehicle electrical box 100 is provided with a pull-out bottom plate on the bottom side in the height direction, and a distribution board 101 is provided inside the under-vehicle electrical box 100.

[0057] In this embodiment, in the design of the undercar electrical box 100, convenient maintenance of the DC area 200 and the AC area 300 is achieved by arranging rotatable opening and closing inspection doors on both sides in the length direction and equipping the bottom side with a pull-out opening and closing bottom plate. The advantage of this design is that the rotating opening and closing mechanism of the inspection door allows maintenance personnel to easily enter the DC and AC areas to carry out necessary inspections, repairs or replacements without disassembling or moving other parts of the electrical box, thereby saving maintenance time and reducing labor intensity. At the same time, the pull-out design of the bottom plate makes the maintenance of the switchboard 101 and other internal components more direct and simple, further optimizing the maintenance process. In addition, the opening and closing design of the inspection door and the bottom plate also improves safety because they can provide physical isolation for workers during maintenance to prevent accidental contact with live parts. Overall, these design features improve the maintainability, safety and operating efficiency of the undercar electrical box.

[0058] In some embodiments, taking the example of a switchboard 101 disposed inside the undercar electrical box 100, the switchboard 101 is located in the first area of ​​the DC area 200, and the DC area skirt 210 is located in the second area of ​​the DC area 200. Figure 2 Taking the orientation in as an example, it can be seen that the first area is the left part of the DC zone 200, and the second area is the right part of the DC zone 200. The DC zone skirt 210 and the network host and diode components arranged thereon are located in a convenient reading position. The components on the distribution board 101 are durable and not easily damaged, making the spatial distribution of the DC zone 200 reasonable.

[0059] In some embodiments, the distribution board 101 is vertically arranged, and the distribution board 101 has a double-layer disk structure. The first-layer disk structure 1011 can be pulled out vertically, and the first-layer disk structure 1011 is used for maintenance when pulled out, and the second-layer disk structure 1012 is used to be exposed when the first-layer disk structure 1011 is pulled out for maintenance.

[0060] In this embodiment, in the undercar electrical box 100, the vertical double-layer disk structure design adopted by the switchboard 101 provides significant maintenance and operation advantages: first, the double-layer disk structure allows the first layer of the disk to be repaired when it is pulled out without affecting the second layer of the disk. This design greatly improves the accessibility and convenience of maintenance. Secondly, when the first layer of the disk structure 1011 is pulled out, the second layer of the disk structure 1012 is immediately exposed, which is convenient for further maintenance or replacement. Such a design reduces maintenance time and improves efficiency. In addition, the vertically arranged switchboard 101 may also help optimize space utilization, making the internal layout of the electrical box more compact, thereby saving more space for the undercar electrical box and leaving more room for other components or functions of the vehicle. In short, this innovative switchboard design enhances the functionality of the undercar electrical box and the overall maintenance economy of the vehicle by simplifying the maintenance process, improving operational safety and space utilization.

[0061] In a specific embodiment, when the under-vehicle electrical box is inspected and maintained, for the skirt side: open the detachable inspection door at the skirt position, so that the DC area host and all the equipment in the AC area can be inspected; for the non-skirt side (the middle of the box): open the pull-out bottom plate during inspection, and a distribution board 101 is arranged in the middle, and the first-layer disk structure 1011 of the distribution board 101 is located on the inner side and adopts a pull-out structure, and the second-layer disk structure 1012 is located on the outer side and adopts a fixed structure. The first-layer disk structure 1011 is pulled out downward for inspection and maintenance. When the first-layer disk structure 1011 is pulled out, the second-layer disk structure 1012 is completely exposed, so that the second-layer disk structure 1012 can be inspected and maintained.

[0062] Please refer to Figure 5 , Figure 5 A top view of the under-vehicle electrical box provided in an embodiment of the present application.

[0063] In some embodiments, a heat dissipation fin 102 is disposed on the top side of the under-vehicle electrical box 100 in the height direction.

[0064] Please refer to Figure 6 , Figure 6 This is a heat dissipation diagram of the under-vehicle electrical box under natural cooling provided in an embodiment of the present application.

[0065] like Figure 6 As shown, for the ventilation and heat dissipation of the undercar electrical box, a heat dissipation fin 102 is used on the top of the undercar control box to achieve a natural cooling effect. The heat dissipation fin 102 significantly improves the heat dissipation efficiency, increases the heat dissipation area, and helps to dissipate the heat inside the box to the outside, thereby maintaining the temperature of the electrical equipment stable. Since the structure of the natural cooling part is simple, the need for moving parts is reduced, which reduces maintenance costs and improves the reliability of the system.

[0066] In some embodiments, an exhaust fan 103 is disposed inside the under-vehicle electrical box 100 , and an air inlet 104 and an air outlet 105 are disposed on both sides of the under-vehicle electrical box 100 in the width direction, and a breathing valve is installed on the air inlet 104 .

[0067] Please refer to Figure 7 , Figure 7 A heat dissipation diagram of the under-vehicle electrical box under forced ventilation provided in an embodiment of the present application.

[0068] like Figure 7 As shown in the figure, for the ventilation and heat dissipation of the undercar electrical box, forced ventilation is achieved by setting an exhaust fan. The use of an exhaust fan to force ventilation of the undercar electrical box provides the following benefits: forced ventilation can more actively control the temperature inside the electrical box, actively exhaust the hot air through the exhaust fan, accelerate the removal of hot air, and effectively prevent overheating of internal equipment. Compared with natural cooling, forced ventilation can still maintain efficient heat dissipation when the ambient temperature is high or the internal heat load increases, which improves the adaptability of the electrical box to different operating conditions. The forced ventilation part can accurately control the heat dissipation by adjusting the speed of the exhaust fan, achieving more sophisticated temperature management.

[0069] As an option, two axial fans are set in the AC area and two axial fans in the DC area. The LCU or network host controls the fan through feedback from the temperature and humidity sensors. Based on CFD (computational fluid dynamics) simulation calculations, the temperature can be controlled at 62~64℃ and the humidity can be controlled at 63%~70%. For air intake and exhaust, the external airflow enters from the air inlets (breathing valves) on both sides of the box, passes through the heating area, passes through the fans, and enters the independent cavities and is discharged outside the box.

[0070] Specifically, in the thermal management and environmental monitoring technology solutions for the undercar electrical box, advanced sensors and intelligent control units can be further integrated to improve overall performance. Specifically, the undercar electrical box can be equipped with temperature and humidity sensors with temperature monitoring and humidity monitoring functions, which can monitor the environmental status inside the electrical box in real time. By connecting these temperature and humidity sensors to the exhaust fan and connecting them to an intelligent controller, such as a vehicle control unit (LCU) or a network host, an automatic control strategy based on sensor feedback can be implemented.

[0071] Computational fluid dynamics (CFD) simulations can be used to optimize the fan's operating mode and layout to ensure that the temperature inside the electrical box is maintained at 62-64°C and the humidity is controlled within an appropriate range of 63%-70%. Such environmental conditions help ensure the safe operation of electrical equipment and extend its service life.

[0072] In addition, for the air intake and exhaust design of the undercar electrical box, the air intake (breathing valve) on both sides can be used to allow the external airflow to enter the box smoothly. After the airflow passes through the heating area, it is driven by the axial flow fan and discharged outside the box through an independent cavity. This design not only improves the heat dissipation efficiency, but also helps prevent the accumulation of dust and moisture, further improving the reliability and durability of the electrical box.

[0073] Through the expansion of the above technical solutions, the undercarriage electrical box can achieve more intelligent and automated temperature and humidity control, providing a more stable and safe operating environment for the electrical system of rail transit vehicles.

[0074] In summary, the ventilation and heat dissipation solution for the under-vehicle electrical box helps reduce the failure and maintenance requirements of electrical equipment caused by long-term overheating, thereby extending the service life of the equipment and reducing maintenance costs, reducing the risk of fire caused by excessive temperature, and enhancing the safety of the vehicle. By combining natural cooling with forced ventilation in the solution, efficient and economical heat dissipation can be achieved. Natural cooling works when the ambient temperature is low, reducing energy consumption and extending the service life of the exhaust fan; when the external temperature rises or the internal heat load increases, the forced ventilation system automatically starts to ensure the heat dissipation effect and avoid overheating of electrical equipment. This intelligent heat dissipation management system not only improves the reliability and adaptability of the electrical box, but also reduces energy waste through precise control, extends the life of the equipment, and reduces maintenance costs.

[0075] In some embodiments, filter cotton is installed on both the air inlet 104 and the air outlet 105 .

[0076] In this embodiment, for the protection of the undercar electrical box, primary and medium efficiency filter cottons are installed at the air inlet and outlet of the box to effectively prevent 1-5um dust from entering the box. In addition, removable inspection doors are installed at both ends of the box, and a movable sliding door is installed at the bottom. The cabinet door and the box are sealed with silicone sponge.

[0077] Please refer to Figure 8 , Figure 8 for Figure 5 GG cross-sectional view of the lower electrical box of the CRRC.

[0078] In this embodiment, the on-board DC cabinet, AC cabinet, control cabinet, under-car junction box and contactor box are integrated into the under-car control box to solve the problem of space shortage in the car and reduce weight, thereby freeing up the space of the on-board electrical cabinet and reducing the weight of the entire vehicle.

[0079] In some embodiments, the DC zone skirt plate 210 is arranged with a network host and a diode assembly, and the DC zone top plate is arranged with a branch terminal row.

[0080] In some embodiments, the AC zone skirt board 310 is arranged with AC devices such as AC auxiliary contactors, contactors, relays and knife switches, and the AC zone top board is arranged with branch terminal blocks.

[0081] In some embodiments, the DC zone box panel 220 and the AC zone box panel 320 are arranged with connectors and cable duct sealing modules to realize incoming and outgoing lines of the DC zone 200 and the AC zone 300 .

[0082] In some embodiments, the distribution board 101 is arranged with a power supply device, a contactor, a relay, a resistor disk, a surge disk, and an overvoltage absorption disk. Because the distribution board 101 has a double-layer disk structure, the above components can be reasonably distributed on the double-layer disk structure according to actual conditions.

[0083] The present application also provides a rail transit vehicle, comprising the above-mentioned under-vehicle electrical box 100.

[0084] In this embodiment, the rail transit vehicle should have all the components of the above-mentioned undercarriage electrical box 100, which will not be described one by one here.

[0085] As an option, the rail transit vehicle is a hydrogen-powered rail transit vehicle.

[0086] It should be noted that many of the components mentioned in this application are universal standard parts or components known to those skilled in the art, and their structures and principles can be learned by those skilled in the art through technical manuals or through conventional experimental methods.

[0087] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0088] The rail transit vehicle and its undercarriage electrical box provided by the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. An undercar electrical box, characterized in that: The under-vehicle electrical box is installed under the vehicle, and the under-vehicle electrical box adopts a method of integrating the DC cabinet, AC cabinet and control cabinet on the vehicle, and the junction box and contactor box under the vehicle; the interior of the under-vehicle electrical box is divided into a DC area and an AC area, and the DC area is provided with DC devices and DC lines, and the AC area is provided with AC devices and AC lines, and the DC area and the AC area are both provided with independent maintenance doors.

2. The undercar electrical box according to claim 1, characterized in that: The DC zone and the AC zone are divided in the length direction of the under-vehicle electrical box, the DC zone has a DC zone skirt plate, a DC zone top plate and a pair of DC zone box plates, the DC zone skirt plate and the DC zone top plate are connected between the pair of DC zone box plates, the AC zone has an AC zone skirt plate, an AC zone top plate and a pair of AC zone box plates, the AC zone skirt plate and the AC zone top plate are connected between the pair of AC zone box plates.

3. The under-vehicle electrical box according to claim 2, characterized in that: The DC zone skirt is arranged with a network host and a diode assembly, and the DC zone top plate is arranged with a branching terminal row; and / or, The AC zone skirt is provided with AC auxiliary contactors, contactors, relays and knife switches, and the AC zone top is provided with branch terminal blocks; and / or, The DC area box panel and the AC area box panel are arranged with connectors and cable duct sealing modules to realize the incoming and outgoing lines of the DC area and the AC area.

4. The under-vehicle electrical box according to claim 2, characterized in that: A DC zone separator is arranged inside the under-vehicle electrical box, and the DC zone separator separates the DC zone into two areas in the length direction of the under-vehicle electrical box.

5. The under-vehicle electrical box according to claim 4, characterized in that: A distribution board is arranged inside the under-vehicle electrical box. The distribution board is located in the first area of ​​the DC zone, and the DC zone skirt is located in the second area of ​​the DC zone.

6. The under-vehicle electrical box according to claim 5, characterized in that: The switchboard is vertically arranged and has a double-layer disk structure. The first-layer disk structure can be pulled out vertically and is used for maintenance when pulled out. The second-layer disk structure is exposed when the first-layer disk structure is pulled out for maintenance.

7. The under-vehicle electrical box according to claim 1, characterized in that: A metal partition is provided inside the undercar electrical box. The metal partition is located at the junction of the DC zone and the AC zone. The metal partition is used to separate the DC zone and the AC zone to avoid line interference.

8. The under-vehicle electrical box according to claim 1, characterized in that: The under-vehicle electrical box is provided with rotatable inspection doors on both sides in the length direction, the inner side of the first inspection door leads to the DC area, and the inner side of the second inspection door leads to the AC area. The under-vehicle electrical box is provided with a pull-out bottom plate on the bottom side in the height direction.

9. The under-vehicle electrical box according to claim 1, characterized in that: The under-vehicle electrical box is provided with cooling fins on the top side in the height direction, an exhaust fan is provided inside the under-vehicle electrical box, and air inlets and air outlets are provided on both sides of the under-vehicle electrical box in the width direction, a breathing valve is installed on the air inlet, and filter cotton is installed on the air inlet and the air outlet.

10. A rail transit vehicle, characterized in that: It comprises the under-vehicle electrical box as claimed in any one of claims 1 to 9.

Images