Railway vehicle wastewater discharge system

Abstract

This invention discloses a wastewater discharge system for rail vehicles, including a drainage conduit and a drainage head. One end of the drainage conduit extends to the outer side of the vehicle's bottom, guiding wastewater generated by equipment inside the vehicle to the outside for discharge. The drainage head is cup-shaped, including an opening, a drainage end, a side wall, and a bottom wall. The end of the drainage conduit located on the outer side of the vehicle's bottom is detachably fixed inside the drainage head via the opening. The drainage end is located away from the opening. The bottom wall is located at the drainage end. Multiple through holes are formed on the bottom wall and the side wall of the drainage end for wastewater discharge. This invention, by setting a drainage head at the end of the drainage conduit and multiple through holes at the drainage end of the drainage head, achieves wastewater discharge while preventing external foreign objects from entering the drainage conduit, ensuring smooth wastewater discharge from rail vehicles and meeting the hygiene standards of rail vehicles, thereby meeting the needs of conducting medical and health services on rail vehicles.

Description

Technical Field

[0001] This invention belongs to the field of rail vehicle technology, specifically, it relates to a rail vehicle wastewater discharge system. Background Technology

[0002] The water supply and sanitation system of a rail vehicle is a system that provides passengers with water for washing and drinking, as well as for related equipment inside the train, while simultaneously discharging wastewater and sewage. Drainage pipes for each water-using device on a rail vehicle are generally equipped with wastewater discharge pipes under the vehicle to discharge wastewater generated by these devices. Some special-purpose rail vehicles, such as the Health Express, a vehicle used for medical surgery, have higher requirements for interior hygiene, prohibiting foreign objects from entering the vehicle.

[0003] There are two ways in which foreign objects can enter a vehicle. First, when the vehicle is running, due to its good airtightness, a certain pressure difference between the inside and outside of the vehicle is generated during operation, and small foreign objects can be sucked into the vehicle through the drain pipe. Second, when the vehicle is stopped, insects and rodents can enter the vehicle through the drain pipe, posing a risk to the cleanliness of the vehicle and the use of medical equipment. Summary of the Invention

[0004] This invention provides a wastewater discharge system for rail vehicles that can both ensure normal wastewater discharge and prevent foreign objects from entering the vehicle.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A wastewater discharge system for rail vehicles includes a drainage pipe and a drainage head;

[0007] One end of the drainage pipe extends to the outside of the vehicle bottom, and is used to guide wastewater generated by the equipment inside the vehicle to the outside of the vehicle for discharge.

[0008] The drain head is cup-shaped and includes an opening, a drain end, a side wall, and a bottom wall. The end of the drain pipe located on the outer side of the vehicle bottom is detachably fixed inside the drain head by the opening. The drain end is located at the end away from the opening. The bottom wall is located at the drain end. Multiple through holes are formed on the bottom wall and the side wall of the drain end for wastewater discharge.

[0009] According to some specific embodiments of this application, each of the through holes located on the bottom wall is distributed on a plurality of concentric circles with the center of the bottom wall as the center;

[0010] Each of the through holes located on the sidewall is uniformly arranged along a plurality of wiring lines along the length of the sidewall; each of the wiring lines is uniformly distributed along the circumference of the sidewall on the sidewall.

[0011] According to some specific embodiments of this application, it also includes an anti-detachment chain, which is a deformable long chain, with one end connected to the bottom of the vehicle and the other end connected to the end of the drain head near the opening.

[0012] According to some specific embodiments of this application, it also includes an inspection hook, which includes a hook end and a connecting end; the connecting end is connected to the end of the drain head near the opening; the hook end includes a hook structure for hooking the drain head onto the inspection ring at the bottom of the vehicle when the drain head is disconnected from the drain duct.

[0013] According to some specific embodiments of this application, a connecting ring is also provided on the outer side wall of the drain head near the opening, which is rotatably connected to the side wall on a single axis, and the axis of rotation tends to be perpendicular to the surface where the side wall is located.

[0014] The connecting end and the other end of the anti-derailment chain are respectively connected to the connecting ring.

[0015] According to some specific embodiments of this application, at least one radially outwardly extending connecting post is formed on the same circumference of one end of the drain duct that extends to the outer side of the bottom of the vehicle.

[0016] At least one mounting groove is formed at the end of the drain head near the opening, located at the same height as the drain head, connecting the inner and outer sides of the sidewall, and includes an inlet section, an anti-detachment section, and a hook section; the inlet section extends inward from the opening along the length direction of the sidewall; the anti-detachment section extends circumferentially along the sidewall, with one end connected to the end of the inlet section located inside the opening; the hook section extends from the other end of the anti-detachment section along the length direction of the sidewall toward the opening, but does not reach the opening;

[0017] The connecting column is installed inside the hanging section; the drain head is hung on the connecting column.

[0018] According to some specific embodiments of this application, the drain head is cylindrical and further includes a cleaning section located between the mounting groove and the drain end, for storing water and cleaning each of the through holes along the inner side of the sidewall of the cleaning section using a piston.

[0019] According to some specific embodiments of this application, the sidewall of the cleaning section near the opening has an inward taper in the direction from the opening toward the bottom wall;

[0020] The end of the drain head near the opening has the same diameter as the end of the cleaning section near the opening; the end of the drain head near the bottom wall has the same diameter as the end of the cleaning section away from the opening.

[0021] According to some specific embodiments of this application, a one-way valve is also included, which is disposed in the drain duct to prevent water from the outside of the vehicle from flowing back into the vehicle.

[0022] According to some specific embodiments of this application, it also includes a water level sensor, a controller, and an alarm;

[0023] The water level sensor is installed inside the drainage pipe to detect the water level inside the drainage pipe and generate a water level signal; the controller is connected to the water level sensor and the alarm respectively, and receives the water level signal in real time, and controls the alarm to operate according to the received water level signal.

[0024] Compared with the prior art, the advantages and positive effects of the present invention are as follows: The rail vehicle wastewater discharge system of the present invention discharges wastewater while blocking external foreign objects from entering the drainage pipe by setting a drain head at the end of the drainage pipe and forming multiple through holes at the drain end of the drain head, thereby ensuring smooth discharge of rail vehicle wastewater and meeting the hygiene standards of rail vehicles, and thus meeting the needs of carrying out medical and health affairs on rail vehicles. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a structural embodiment of a wastewater discharge system for rail vehicles proposed in this invention.

[0027] Figure 2 This is a structural diagram of a drain head at one angle.

[0028] Figure 3 This is a structural diagram of the drain head from another angle;

[0029] Figure 4 This is a schematic diagram of the drain head structure of another embodiment of the wastewater discharge system for rail vehicles proposed in this invention;

[0030] Figure 5 This is a schematic diagram of the longitudinal cross-sectional structure of the drainage pipe;

[0031] Figure 6 This is a structural diagram of one angle of a drainage pipe.

[0032] Figure 7 This is a schematic diagram of the third embodiment of a wastewater discharge system for rail vehicles proposed in this invention;

[0033] Figure 8 This is a control function block diagram of the fourth embodiment of a wastewater discharge system for rail vehicles proposed in this invention.

[0034] In the picture,

[0035] 1. Drainage pipe; 2. Drainage head; 3. Anti-detachment chain; 4. Maintenance hook; 5. Connecting ring; 6. One-way valve; 7. Controller; 8. Water level sensor; 9. Alarm; 11. Connecting column; 21. Opening; 22. Bottom wall; 23. Side wall; 24. Drainage end; 25. Mounting groove; 26. Through hole; 27. Cleaning section; 41. Hook end; 42. Connecting end; 251. Inlet section; 252. Anti-detachment section; 253. Hanging section. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals 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 intended to explain the present invention, and should not be construed as limiting the present invention.

[0037] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 The present invention discloses a wastewater discharge system for rail vehicles, including a drainage pipe 1 and a drainage head 2.

[0038] One end of the drain pipe 1 extends to the outside of the vehicle bottom, and the other end is connected to the water-saving equipment to guide the wastewater generated by the water-using equipment inside the vehicle to the outside of the vehicle for discharge.

[0039] The drain head 2 is cup-shaped, including an opening 21, a drain end 24, a side wall 23, and a bottom wall 22. The drain end 24 is located at the end of the drain head 2 away from the opening 21. The bottom wall 22 is located at the bottom of the end of the drain end 24; that is, the bottom wall 22 is located on the end face of the end of the drain head 2 away from the opening 21. The end of the drain duct 1 located on the outer side of the vehicle bottom is installed into the drain head 2 through the opening 21 and is detachably and fixedly connected to the drain head 2. Multiple through holes 26 are formed on the bottom wall 22 and the side wall 23 of the drain end 24 for wastewater discharge and to prevent external foreign objects from entering the drain duct 1, ensuring smooth drainage of the rail vehicle and meeting the hygiene standards of the rail vehicle.

[0040] The wastewater discharge system for rail vehicles of the present invention discharges wastewater while blocking external foreign objects from entering the drainage pipe 1 by setting a drain head 2 at the end of the drainage pipe 1 and setting multiple through holes 26 at the drain end 24 of the drain head 2. This ensures smooth discharge of wastewater from rail vehicles and meets the hygiene standards of rail vehicles, thereby meeting the needs of carrying out medical and health affairs in rail vehicles.

[0041] The specific structure and principle of the rail vehicle wastewater discharge system of the present invention will be described in detail below through specific embodiments.

[0042] According to some specific embodiments of this application, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 The through holes 26 located on the bottom wall 22 are evenly distributed on multiple concentric circles with the center of the bottom wall 22 as the center.

[0043] Each through hole 26 located on the side wall 23 is evenly arranged along multiple rows of wires along the length of the side wall 23; each row of wires is evenly distributed on the side wall 23 along the circumference of the side wall 23.

[0044] In this embodiment, the wastewater discharge system for rail vehicles has through holes 26 evenly and symmetrically arranged on the bottom wall 22 and side wall 23 of the drainage end 24. This ensures that the drainage head 2 experiences a balanced drainage reaction force during drainage, preventing it from tilting or shifting due to uneven force. Furthermore, the regular arrangement of the through holes 26 reduces the difficulty of machining them, improves machining efficiency, and lowers costs.

[0045] According to some specific embodiments of this application, refer to Figure 1 , Figure 2 , Figure 4 , Figure 7 The wastewater discharge system for rail vehicles also includes an anti-detachment chain 3, which is a deformable long chain with one end connected to the bottom of the vehicle and the other end connected to the end of the drain head 2 near the opening 21, to prevent the drain head 2 from falling or being lost when it is disconnected from the drain pipe 1.

[0046] According to some specific embodiments of this application, refer to Figure 1 , Figure 7 The wastewater discharge system for rail vehicles also includes a maintenance hook 4, which includes a hook end 41 and a connecting end 42. The connecting end 42 is connected to the end of the drain head 2 near the opening 21. The hook end 41 includes a hook structure for hooking the drain head 2 onto the maintenance ring at the bottom of the vehicle when it is disconnected from the drain pipe 1, to prevent the drain head 2 from shaking when it is disconnected from the drain pipe 1 and suspended below the other end of the anti-derailment chain 3, thus affecting the maintenance of the drain pipe 1 and its related equipment.

[0047] According to some specific embodiments of this application, refer to Figure 1 , Figure 7 The wastewater discharge system for rail vehicles also includes a maintenance hook 4 and a maintenance ring; the maintenance hook 4 includes a hook end 41 and a connecting end 42; the connecting end 42 is connected to the end of the drain head 2 near the opening 21; the hook end 41 includes a hook structure; the maintenance ring is a ring structure and is fixedly installed at the bottom of the vehicle; when the drain head 2 is disconnected from the drain pipe 1, the drain head 2 is hooked onto the maintenance ring at the bottom of the vehicle through the hook end 41, preventing the drain head 2 from shaking when it is disconnected from the drain pipe 1 and suspended below the other end of the anti-derailment chain 3, thus affecting the maintenance of the drain pipe 1 and its related equipment.

[0048] Of course, when the inspection ring is connected to the bottom of the vehicle, the inspection ring can rotate around its radial axis. The direction of the inspection hook 4 can be adjusted by adjusting the orientation of the axis of the inspection ring, which facilitates the connection and improves the connection efficiency.

[0049] According to some specific embodiments of this application, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 A connecting ring 5 is also provided on the outer side of the side wall 23 near the opening 21 of the drain head 2. It can be rotatably connected to the side wall 23 on a single axis, and the axis of rotation tends to be perpendicular to the plane where the side wall 23 is located. That is, the axis of rotation of the connecting ring 5 tends to be perpendicular to the tangent plane of the side connected to the connecting ring 5.

[0050] The other end of the connecting end 42 and the anti-derailment chain 3 are respectively connected to the connecting ring 5; specifically, the other end of the anti-derailment chain 3 and the connecting end 42 each include a ring structure, which is threaded onto the circumference of the connecting ring 5.

[0051] The wastewater discharge system for rail vehicles in this embodiment achieves multiple degrees of freedom for the other end of the anti-derailment chain 3 and the hook 4 by connecting them to the connecting ring 5, and simplifies the connection structure.

[0052] According to some specific embodiments of this application, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 The detachable and fixed connection between the drain pipe 1 and the drain head 2 is achieved through the following structure.

[0053] At least one radially outwardly extending connecting post 11 is formed on the same circumference of the end of the drain duct 1 that extends to the outer side of the bottom of the vehicle. It is a cylindrical structure.

[0054] At least one mounting groove 25 is formed at one end of the drain head 2 near the opening 21 for connection with the connecting post 11; when there are multiple mounting grooves 25, they are located on the same circumference of the drain head 2; the number of connecting posts 11 is equal to the number of mounting grooves 25. That is, each mounting groove 25 is located at the same height of the drain head 2; each connecting post 11 is located at the same height of the drain conduit 1; each connecting post 11 corresponds to each mounting groove 25 and is connected to each mounting groove 25 respectively.

[0055] The mounting groove 25 connects the inner and outer sides of the sidewall 23 and includes an inlet section 251, an anti-detachment section 252, and a hook section 253. Specifically, the mounting groove 25 is an irregularly shaped through hole 26 located on the sidewall 23, comprising an inlet section 251, an anti-detachment section 252, and a hook section 253. One end of the inlet section 251 is open and communicates with the opening 21 of the drain head 2, extending along the length of the sidewall 23 towards the inner side of the opening 21. The anti-detachment section 252 extends along the circumferential direction of the sidewall 23, with one end connected to and communicating with the other end of the inlet section 251. The hook section 253 extends along the length of the sidewall 23 towards the opening 21, with one end... The other end of the anti-detachment section 252 is connected and communicated with the other end of the hanging section 253. The other end of the hanging section 253 does not reach the opening 21 and is located inside the opening 21. The mounting groove 25 forms the installation path of the connecting column 11. The connecting column 11 enters the mounting groove 25 from the end of the inlet section 251 located in the opening 21 and reaches the hanging section 253 through the anti-detachment section 252. The drain head 2 is hung on the connecting column 11 by gravity and the hanging section 253. The connecting column 11 is held at the end of the other end of the hanging section 253 by gravity. The length of the hanging section 253 and the length of the anti-detachment section 252 prevent the connecting column 11 from falling out of the mounting groove 25, thus achieving the anti-detachment effect.

[0056] In this embodiment, the wastewater discharge system for rail vehicles uses an anti-detachment structure composed of a connecting column 11 and a mounting groove 25 to securely install the drain pipe 1 in one end of the drain head 2 near the opening 21, and the drain head 2 is securely attached to the other end of the drain pipe 1. This improves the stability of the connection between the drain pipe 1 and the drain head 2, thereby enhancing the stability of the discharge system in preventing external foreign objects from entering the drain pipe 1. Furthermore, the connection between the mounting groove 25, which includes an inlet section 251, an anti-detachment section 252, and a hook section 253, and the connecting column 11 allows for easy connection and disconnection of the drain pipe 1 and the drain head 2 simply by moving the drain head 2 relative to the drain pipe 1 along the shape of the mounting groove 25, improving assembly and disassembly efficiency and thus maintenance efficiency.

[0057] According to some specific embodiments of this application, refer to Figure 1 , Figure 2 , Figure 4 , Figure 7The drain head 2 also includes a cleaning section 27, which is located between the mounting groove 25 and the drain end 24. It is used to store water and to push the piston along the inner side of the side wall 23 of the cleaning section 27 toward the drain end 24 to clean each through hole 26.

[0058] The wastewater discharge system for rail vehicles in this embodiment improves the cleaning efficiency of the drainage head 2 by setting a cleaning section 27 in the middle of the drainage head 2 to facilitate the cleaning of each through hole 26.

[0059] According to some specific embodiments of this application, refer to Figure 4 The side wall 23 of the cleaning section 27 near the opening 21 has an inward taper from the opening 21 side to the bottom wall 22 side. The other end of the cleaning section 27 is cylindrical.

[0060] The end of the drain head 2 near the opening 21 is not cylindrical, and has the same diameter as the end of the cleaning section 27 near the opening 21; the end of the drain head 2 near the bottom wall 22 is cylindrical, and has the same diameter as the other end of the cleaning section 27.

[0061] The wastewater discharge system for rail vehicles in this embodiment is designed with a tapered shape at the end of the cleaning section 27 near the opening 21, which has a contraction tendency. This allows the end of the drain head 2 near the opening 21 to have a larger inner diameter, making it easier for the piston used to clean the drain end 24 to be placed into the cleaning section 27 inside the drain head 2, thereby improving cleaning efficiency.

[0062] According to some specific embodiments of this application, refer to Figure 7 The track wastewater discharge system also includes a one-way valve 6, which is installed in the drainage guide rail to prevent backflow into the vehicle when the water level is high in extreme external conditions, thus protecting the water-using equipment and sanitary facilities inside the vehicle.

[0063] According to some specific embodiments of this application, refer to Figure 8 The wastewater discharge system for rail vehicles also includes a water level sensor 8, a controller 7, and an alarm 9.

[0064] The water level sensor 8 is installed inside the drainage pipe 1 to detect the water level inside the drainage pipe 1 and generate a water level signal; the controller 7 is connected to the water level sensor 8 and the alarm 9 respectively, receives the water level signal generated by the water level sensor 8 in real time, and controls the alarm 9 to act according to the received water level signal.

[0065] Specifically, the controller 7 is set with an alarm water level threshold. It compares the water level signal with the alarm water level threshold and determines whether the water level in the drain pipe 1 exceeds the alarm water level threshold based on the comparison result. When the water level exceeds the alarm water level threshold, it controls the alarm 9 to sound an alarm, prompting the staff to clean the drain pipe 1 and / or the drain head 2.

[0066] Alarm 9 can be an audible and visual alarm device or a display.

[0067] Of course, the wastewater discharge system for rail vehicles may also include only a water level sensor 8 and an alarm 9; the water level sensor 8 is directly connected to the alarm 9 and controls the alarm 9 to operate.

[0068] The wastewater discharge system for rail vehicles in this embodiment monitors the drainage situation by setting up a water level sensor 8 and an alarm 9. It can detect drainage problems in advance and prevent sanitary and safety accidents caused by drainage failure.

[0069] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0070] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0071] 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0072] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A wastewater discharge system for rail vehicles, characterized in that, include: A drain pipe, one end of which extends to the outside of the vehicle bottom, is used to guide wastewater generated by equipment inside the vehicle to the outside of the vehicle for discharge. A drain head, cup-shaped, includes an opening, a drain end, a side wall, and a bottom wall. The end of the drain conduit located on the outer side of the vehicle's bottom is detachably fixed within the drain head via the opening. The drain end is located away from the opening. The bottom wall is located at the drain end. Multiple through holes are formed on the bottom wall and the side wall of the drain end for wastewater discharge. At least one radially outwardly extending connecting post is formed on the same circumference of the end of the drain conduit extending to the outer side of the vehicle's bottom. A [further details about the drain head and its components are missing from the original text.] There is at least one mounting groove located at the same height as the drain head, connecting the inner and outer sides of the sidewall, including an inlet section, an anti-detachment section, and a hook section; the inlet section extends inward from the opening along the length of the sidewall; the anti-detachment section extends circumferentially along the sidewall, with one end connected to the end of the inlet section located inside the opening; the hook section extends from the other end of the anti-detachment section along the length of the sidewall toward the opening, but does not reach the opening; the connecting post is installed in the hook section; the drain head is hooked onto the connecting post.

2. The wastewater discharge system for rail vehicles according to claim 1, characterized in that, The through holes located on the bottom wall are distributed on a plurality of concentric circles with the center of the bottom wall as the center; Each of the through holes located on the sidewall is uniformly arranged along a plurality of wiring lines along the length of the sidewall; each of the wiring lines is uniformly distributed along the circumference of the sidewall on the sidewall.

3. The wastewater discharge system for rail vehicles according to claim 1, characterized in that, It also includes an anti-derailment chain, which is a deformable long chain, with one end connected to the bottom of the vehicle and the other end connected to the end of the drain head near the opening.

4. The wastewater discharge system for rail vehicles according to claim 3, characterized in that, It also includes a maintenance hook, which includes a hook end and a connecting end; the connecting end is connected to the end of the drain head near the opening; the hook end includes a hook structure for hooking the drain head onto the maintenance ring at the bottom of the vehicle when it is disconnected from the drain pipe.

5. The wastewater discharge system for rail vehicles according to claim 4, characterized in that, A connecting ring is also provided on the outer side wall of the drain head near the opening, which can be rotatably connected to the side wall on a single axis, and the axis of rotation tends to be perpendicular to the plane where the side wall is located. The connecting end and the other end of the anti-derailment chain are respectively connected to the connecting ring.

6. The wastewater discharge system for rail vehicles according to any one of claims 1 to 5, characterized in that, The drain head is cylindrical and also includes a cleaning section located between the mounting groove and the drain end. It is used to store water and to clean each of the through holes using a piston along the inner side of the side wall of the cleaning section.

7. The wastewater discharge system for rail vehicles according to claim 6, characterized in that, The sidewall of the cleaning section near the opening has an inward taper in the direction from the opening toward the bottom wall; The end of the drain head near the opening has the same diameter as the end of the cleaning section near the opening; the end of the drain head near the bottom wall has the same diameter as the end of the cleaning section away from the opening.

8. The wastewater discharge system for rail vehicles according to any one of claims 1 to 5, characterized in that, It also includes a one-way valve, which is located inside the drain pipe to prevent water from outside the vehicle from flowing back into the vehicle.

9. The wastewater discharge system for rail vehicles according to any one of claims 1 to 5, characterized in that, It also includes water level sensors, controllers, and alarms; The water level sensor is installed inside the drainage pipe to detect the water level inside the drainage pipe and generate a water level signal; the controller is connected to the water level sensor and the alarm respectively, receives the water level signal in real time, and controls the alarm to operate according to the received water level signal.

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