Underground drainage system for urban rail

Abstract

The utility model discloses an urban rail underground drainage system, through setting liquid level sensor and controller, system can real -time monitoring catch basin liquid level, and intelligently in vacuum standby, vacuum drainage (small flow) and fixed drainage (large flow) three kinds of mode automatic switching. Under most small drainage capacity working condition, preferentially start efficient vacuum drainage mode, has reduced water pump's start -stop frequency and operating energy consumption significantly, has overcome traditional fixed pump system "big horse draws small cart's" energy waste problem, has possessed vacuum drainage system's advantage of high -efficiency of small -flow drainage of big height promotion, and has retained traditional fixed pump drainage system's advantage of high reliability of large flow, when, the system can automatically seamless switching to fixed drainage mode of vacuum pump and drainage pump cooperation, ensures drainage capacity, has improved system's emergency support ability and reliability greatly.

Description

Technical Field

[0001] This utility model relates to the field of urban drainage technology, specifically to an underground drainage system for urban rail transit. Background Technology

[0002] In the tunnels and underground stations of urban rail transit systems, the discharge of seepage water, structural condensate, and flushing wastewater is a critical aspect of ensuring operational safety. These drainage points are typically collected in sump pits and then pumped to the municipal sewer network via a drainage system. Currently, most common drainage systems employ traditional fixed pump systems, where the pumps are started and stopped directly from the sump pits using level controllers.

[0003] However, such traditional solutions have significant limitations: First, to cope with sudden large influxes of water, such as massive structural leaks or fire-fighting wastewater, pump selection often needs to be designed based on maximum drainage capacity. However, for most of the day, the drainage volume is small, and high-power pumps frequently start and stop or operate inefficiently, resulting in serious energy waste and accelerated equipment wear. Second, a single drainage mode lacks flexibility and cannot intelligently adjust the drainage strategy according to the actual water volume, leading to low efficiency under low flow conditions. Furthermore, for track bed-embedded sump pits, the effective water depth of the pump pit is extremely limited due to the track bed height (usually only 600-800mm, with the floating plate thickness of special damping sections only 340-370mm, and the bottom damping gap only 30mm), after deducting the minimum submersion depth of 200mm for the submersible sewage pump, the effective water depth is only 0-230mm, making traditional submersible sewage pump solutions difficult to implement. Submerging the damping gaps with accumulated water not only reduces the damping effect but also leads to scaling, stray current diffusion, and even signal device failure in the long term, seriously affecting subway operation safety. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model proposes an underground drainage system for urban rail transit. By installing a liquid level sensor and controller, the system can monitor the liquid level in the sump in real time and intelligently switch between three modes: vacuum standby, vacuum drainage (small flow), and fixed drainage (large flow). In most low-volume drainage conditions, the efficient vacuum drainage mode is prioritized, significantly reducing the pump start-up and shutdown frequency and operating energy consumption. When a large influx of water occurs, the system can automatically and seamlessly switch to a fixed drainage mode where the vacuum pump and drainage pump work together, ensuring drainage capacity and greatly improving the system's emergency response capability and reliability.

[0005] The technical solution adopted by this utility model is as follows: An underground drainage system for urban rail transit includes a liquid level sensor, a first electric valve, a second electric valve, a vacuum valve, a vacuum branch pipe, a drainage branch pipe, a drainage main pipe, a vacuum pump, a drainage pump, and a controller. The vacuum valve, the first electric valve, the vacuum branch pipe, the drainage main pipe, and the vacuum pump are connected in sequence to form a vacuum drainage path; the drainage pump, the vacuum valve, the second electric valve, the drainage branch pipe, the drainage main pipe, and the vacuum pump are connected in sequence to form a fixed drainage path; the drainage pump, the vacuum pump, the liquid level sensor, the vacuum valve, the first electric valve, and the second electric valve are respectively connected to the controller, and based on the feedback from the liquid level sensor, When the liquid level is below the first threshold, the controller controls the vacuum pump and the first electric valve to open, and the vacuum valve and the second electric valve to close. When the liquid level reaches the first threshold, the controller controls the vacuum pump, vacuum valve and first electric valve to open, and the second electric valve to close, thus starting the vacuum drainage mode. When the liquid level reaches the second threshold, the controller controls the drain pump, vacuum pump, vacuum valve and second electric valve to open, and the first electric valve to close, thus starting the fixed drainage mode.

[0006] Optionally, it also includes a vacuum end lifter, one end of the vacuum branch pipe extends into the sump, and the other end of the vacuum branch pipe is connected to the main drain pipe. The vacuum end lifter, vacuum valve and first electric valve are arranged sequentially on the vacuum branch pipe from bottom to top; the drain pump, vacuum valve and second electric valve are arranged sequentially on the drain branch pipe from bottom to top.

[0007] Optionally, the vacuum branch pipe is further provided with an adjusting gas supply valve, which is located between the vacuum valve and the vacuum end lifter.

[0008] Optionally, it also includes a gas replenishment unit, which is connected to the vacuum valve and the main drain pipe respectively through a vacuum gas sampling pipe.

[0009] Optionally, the drainage branch pipe is also equipped with a check valve, which is respectively installed between the vacuum valve and the drainage pump, and between the vacuum gas sampling pipe and the main drainage pipe.

[0010] Optionally, the end of the main drainage pipe is sequentially connected to a vacuum tank, a vacuum unit, and a wastewater pipe, and the vacuum unit is connected to a controller.

[0011] Optionally, it also includes a rubber joint, which is disposed on the vacuum branch pipe between the vacuum valve and the vacuum end lifter, and on the drain branch pipe between the vacuum valve and the drain pump.

[0012] Optionally, it also includes a vacuum pressure gauge and a pipeline pressure gauge, wherein the vacuum pressure gauge is installed on the vacuum branch pipe between the vacuum valve and the vacuum terminal lifter, and the pipeline pressure gauge is installed on the drain branch pipe between the vacuum valve and the drain pump.

[0013] Optionally, the wastewater pipe is connected to a wastewater pit, and a wastewater pump is installed in the wastewater pit.

[0014] The beneficial effects of this invention are as follows: By setting up a liquid level sensor and controller, the system can monitor the liquid level in the sump in real time and intelligently switch between three modes: vacuum standby, vacuum drainage (small flow), and fixed drainage (large flow). In most low-volume drainage conditions, the efficient vacuum drainage mode is prioritized, significantly reducing the pump's start-up and shutdown frequency and operating energy consumption. This overcomes the energy waste problem of traditional fixed pump systems ("overpowered pumps for small loads"), combining the advantages of vacuum drainage systems (large lifting height and high efficiency for small flow) with the advantages of traditional fixed pump drainage systems (large flow and high reliability). When a large influx of water occurs, the system can automatically and seamlessly switch to the fixed drainage mode where the vacuum pump and drainage pump work together, ensuring drainage capacity and greatly improving the system's emergency response capability and reliability. Because vacuum drainage equipment has lower requirements for the minimum pumpable water level, compared with the traditional two submersible sewage pump solution, it can reduce the effective volume and depth requirements of the built-in sump pit in the track bed, reduce the impact on the stability of the track bed structure and the stray current return path, and is particularly suitable for working conditions where the space of the built-in sump pit in the track bed is limited and the effective water depth is insufficient. It can avoid water accumulation and submersion of the vibration damping gaps, and ensure the safety of subway operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the urban rail underground drainage system proposed in an embodiment of the present utility model; Figure 2 This is a partially enlarged view of the urban rail underground drainage system proposed in an embodiment of this utility model; Figure 3 This is an enlarged view of another part of the urban rail underground drainage system proposed in an embodiment of this utility model.

[0016] The labels in the attached figures are as follows: 1. Liquid level sensor; 2. First electric valve; 3. Second electric valve; 4. Vacuum valve; 5. Vacuum branch pipe; 6. Drainage branch pipe; 7. Drainage main pipe; 8. Vacuum pump; 9. Drainage pump; 10. Controller; 11. Vacuum end lifter; 12. Adjusting and replenishing air valve; 13. Replenishing air unit; 14. Check valve; 15. Vacuum tank; 16. Vacuum unit; 17. Wastewater pipe; 18. Rubber joint; 19. Vacuum pressure gauge; 20. Pipeline pressure gauge; 21. Sump; 22. Wastewater sump; 23. Wastewater pump; 24. Vacuum air intake pipe; 25. Drain pipe; 26. Third electric valve; 27. Vacuum valve control component; 28. Cleaning port; 29. ​​Quick connector; 30. Sedimentation tank; 31. Trash screen; 32. Water collection bay; 33. Track slab; 34. Vibration damping gap. Detailed Implementation

[0017] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0018] like Figure 1-3 As shown, this embodiment discloses an underground drainage system for urban rail transit, including a liquid level sensor 1, a first electric valve 2, a second electric valve 3, a vacuum valve 4, a vacuum branch pipe 5, a drainage branch pipe 6, a drainage main pipe 7, a vacuum pump 8, a drainage pump 9, a controller 10, a vacuum end lifter 11, a regulating and replenishing air valve 12, a replenishing air unit 13, a check valve 14, a vacuum tank 15, a vacuum unit 16, a wastewater pipe 17, a rubber joint 18, a vacuum pressure gauge 19, and a pipeline pressure gauge 20.

[0019] One end of the vacuum branch pipe 5 extends to the bottom of the sump 21, and the other end connects to the main drain pipe 7. Along the vacuum branch pipe 5, from the sump 21 upwards, are sequentially arranged a vacuum end lifter 11, an adjusting air supply valve 12, a rubber joint 18, a vacuum valve 4, and a first electric valve 2, finally connecting to the main drain pipe 7. The vacuum pressure gauge 19 is installed on the pipeline between the vacuum valve 4 and the vacuum end lifter 11 to monitor the pressure of the vacuum branch pipe 5. The minimum water depth lifted by the vacuum end lifter is 50mm.

[0020] One end of the drainage branch pipe 6 extends to the sump 21, and the other end connects to the main drainage pipe 7. Along the drainage branch pipe 6, from the sump 21 upwards, a drainage pump 9, a check valve 14, a vacuum valve 4, and a second electric valve 3 are sequentially installed, finally connecting to the main drainage pipe 7. The pipeline pressure gauge 20 is installed on the pipeline between the vacuum valve 4 and the drainage pump 9 to monitor the pressure of the drainage branch pipe 6.

[0021] The main drainage pipe 7 is used to collect water from the vacuum branch pipe 5 and the drainage branch pipe 6. Its end is connected in sequence to a vacuum tank 15, a vacuum unit 16, and a wastewater pipe 17. The wastewater pipe 17 is finally connected to the station's main wastewater pool or an intermediate wastewater pit 22. The wastewater pit 22 is equipped with a wastewater pump 23, which is used to further lift the wastewater to a designated discharge point.

[0022] The gas supply unit 13 is connected to the vacuum valve 4 and the drain pipe 7 via the vacuum gas sampling pipe 24, and is used to provide and maintain the necessary vacuum power for the system.

[0023] The liquid level sensor 1 is installed in the sump 21 to monitor the liquid level in the sump in real time. The controller 10 (which can be a PLC or a dedicated control cabinet) is electrically connected to the liquid level sensor 1, vacuum pump 8, drain pump 9, vacuum valve 4, first electric valve 2, second electric valve 3, and vacuum unit 16, respectively. It receives the liquid level signal and controls the start, stop, and switch of each actuator according to preset logic.

[0024] In this embodiment, the urban rail underground drainage system presets two liquid level thresholds through the controller 10: a first drainage threshold (H4) and a second drainage threshold (H5, which is higher than H4).

[0025] Vacuum standby mode (liquid level below H4): When the liquid level sensor 1 detects that the liquid level in the sump 21 has not reached the first drainage threshold H4, the controller 10 controls the vacuum pump 8 and the first electric valve 2 to open, while simultaneously closing the vacuum valve 4 and the second electric valve 3. At this time, a negative pressure environment is pre-established in the vacuum branch pipe 5 to prepare for the upcoming vacuum drainage, and the system is in a low-power standby state.

[0026] Vacuum drainage mode (liquid level reaches H4): When the liquid level rises to H4, the controller 10 controls the vacuum pump 8, vacuum valve 4, and first electric valve 2 to open, while the second electric valve 3 remains closed. System vacuum drainage begins: Under vacuum, the water in the sump 21 is drawn in, passing sequentially through the vacuum end lifter 11 and vacuum branch pipe 5, into the main drainage pipe 7, and finally discharged through the vacuum tank 15, vacuum unit 16, and wastewater pipe 17. This mode is suitable for small to medium drainage volumes, offering high efficiency and energy saving. The regulating air supply valve 12 automatically adjusts the amount of air entering the system during this process, optimizing the air-water mixing ratio, ensuring lifting efficiency (typically up to a 10m lifting height), and preventing water hammer.

[0027] Fixed drainage mode (liquid level reaches H5): When the water volume is too large and the liquid level continues to rise to H5, the controller 10 determines that a high-flow drainage mode needs to be activated. At this time, the controller 10 controls the vacuum pump 8, drainage pump 9, vacuum valve 4, and second electric valve 3 to open, while simultaneously closing the first electric valve 2. The vacuum pump 8 and drainage pump 9 work simultaneously, and the water in the sump 21 is mainly pumped through the drainage branch pipe 6 and discharged through the second electric valve 3 into the main drainage pipe 7. The check valve 14 can prevent backflow of drainage. This mode has a strong drainage capacity to cope with sudden increases in water volume and ensure the safety of the track section. When the water level continues to drop to the elevation H3, the vacuum pump and drainage pump automatically stop running and enter the fixed pump drainage standby mode.

[0028] When the liquid level in the sump 21 rises to the high water level alarm height H6, an high water level alarm will be triggered, alerting operations and management personnel that there is a risk of water accumulation flooding the track bed, requiring close monitoring and focused inspections. When the liquid level in the sump 21 built into the track bed continues to rise to the emergency rescue alarm height H, an emergency rescue alarm will be triggered, alerting operations and management personnel that water accumulation has begun to flood the track bed, requiring emergency rescue and the organization of personnel to eliminate safety risks. The third electric valve is installed on the drain pipe, and can be opened simultaneously when the liquid level is higher than H6.

[0029] The city rail underground drainage system also includes: Rubber joint 18: Installed at pipe connection points, it can effectively compensate for pipe deformation caused by temperature changes and pump vibration, and play a good role in vibration isolation and noise reduction.

[0030] Vacuum pressure gauge 19 and pipeline pressure gauge 20: provide intuitive visual monitoring of the system's operating status, making it easier for maintenance personnel to detect abnormalities in a timely manner.

[0031] Gas supply unit 13: It continuously provides a stable vacuum source for the system, which is the power basis for the normal operation of the vacuum drainage mode.

[0032] Vacuum tank 15: It serves as a buffer, storage unit and gas-water separator, which can stabilize the system vacuum level and protect the subsequent vacuum unit 16.

[0033] Vacuum unit 16: This is the core power source of the system, and typically includes a vacuum pump 8 and a sewage pump. The vacuum pump is responsible for establishing and maintaining the system vacuum, while the sewage pump is used to discharge wastewater to the final destination.

[0034] Cleanout 28: The cleanout is located upstream of the drain trap 32 on the main drain pipe and at the end of the main drain pipe.

[0035] Quick Connector 29: The quick connector is installed on the drain branch pipe between the vacuum valve and the drain pump to provide a quick pipeline connection for temporary mobile pumps.

[0036] Water trap 32: Water trap 32 is installed on the main drainage pipe and is used for segmented transportation in long-distance main drainage pipes.

[0037] This invention, by incorporating a liquid level sensor and controller, enables the system to monitor the liquid level in the sump in real time and intelligently switch between three modes: vacuum standby, vacuum drainage (small flow), and fixed drainage (large flow). In most low-volume drainage conditions, the efficient vacuum drainage mode is prioritized, significantly reducing the pump's start-stop frequency and operating energy consumption. This overcomes the energy waste problem of traditional fixed pump systems ("overpowered pumps for small loads"), combining the advantages of vacuum drainage systems (large lifting height and high efficiency for small flow) with the high flow and high reliability of traditional fixed pump drainage systems. When a large influx of water occurs, the system can automatically and seamlessly switch to a fixed drainage mode where the vacuum pump and drainage pump work together, ensuring drainage capacity and greatly improving the system's emergency response capability and reliability. Because vacuum drainage equipment has lower requirements for the minimum pumpable water level, compared with the traditional two submersible sewage pump solution, it can reduce the effective volume and depth requirements of the built-in sump pit in the track bed, reduce the impact on the stability of the track bed structure and the stray current return path, and is particularly suitable for working conditions where the space of the built-in sump pit in the track bed is limited and the effective water depth is insufficient. It can avoid water accumulation and submersion of the vibration damping gaps, and ensure the safety of subway operation.

[0038] It is understood that the specific embodiments described above are merely for explaining the relevant utility model and not for limiting the utility model. It should also be noted that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict with each other. All equivalent structural transformations made based on the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly included within the protection scope of this utility model.

Claims

1. An urban rail underground drainage system, characterized by, Includes a level sensor, a first electric valve, a second electric valve, a vacuum valve, a vacuum branch pipe, a drain branch pipe, a main drain pipe, a vacuum pump, a drain pump, and a controller. The vacuum valve, the first electric valve, the vacuum branch pipe, the main drain pipe, and the vacuum pump are connected in sequence to form a vacuum drainage passage. The drainage pump, vacuum valve, second electric valve, drainage branch pipe, drainage main pipe, and vacuum pump are connected in sequence to form a fixed drainage passage. The drain pump, vacuum pump, liquid level sensor, vacuum valve, first electric valve, and second electric valve are respectively connected to the controller. Based on the feedback from the liquid level sensor, When the liquid level is below the first threshold, the controller controls the vacuum pump and the first electric valve to open, and the vacuum valve and the second electric valve to close. When the liquid level reaches the first threshold, the controller controls the vacuum pump, vacuum valve and the first electric valve to open, and the second electric valve to close. When the liquid level reaches the second threshold, the controller controls the vacuum pump, drain pump, vacuum valve and second electric valve to open, and the first electric valve to close.

2. The urban rail underground drainage system according to claim 1, characterized in that, It also includes a vacuum end lifter, one end of the vacuum branch pipe extends into the sump, and the other end of the vacuum branch pipe is connected to the main drain pipe. The vacuum end lifter, vacuum valve and first electric valve are arranged on the vacuum branch pipe from bottom to top. The drain pump, vacuum valve and second electric valve are arranged on the drain branch pipe from bottom to top.

3. The urban rail underground drainage system according to claim 1, wherein, The vacuum branch pipe is also equipped with an adjusting gas supply valve, which is located between the vacuum valve and the vacuum end lifter.

4. The urban rail underground drainage system according to claim 1, wherein, It also includes a gas replenishment unit, which is connected to the vacuum valve and the main drainage pipe respectively through a vacuum gas sampling pipe.

5. The urban rail underground drainage system according to claim 4, characterized in that, The drainage branch pipe is also equipped with a check valve, which is respectively installed between the vacuum valve and the drainage pump, and between the vacuum gas sampling pipe and the main drainage pipe.

6. The urban rail underground drainage system according to claim 1, characterized in that, The main drainage pipe is connected in sequence to a vacuum tank, a vacuum unit, and a wastewater pipe, and the vacuum unit is connected to a controller.

7. The urban rail underground drainage system according to claim 1, characterized in that, It also includes a rubber joint, which is installed on the vacuum branch pipe between the vacuum valve and the vacuum end lifter, and on the drain branch pipe between the vacuum valve and the drain pump.

8. The urban rail underground drainage system of claim 1, wherein, It also includes a vacuum pressure gauge and a pipeline pressure gauge. The vacuum pressure gauge is installed on the vacuum branch pipe between the vacuum valve and the vacuum terminal lifter, and the pipeline pressure gauge is installed on the drain branch pipe between the vacuum valve and the drain pump.

9. The urban rail underground drainage system according to claim 6, wherein, The wastewater pipe is connected to a wastewater pit, and a wastewater pump is installed in the wastewater pit.

Images