Tunnel sewage pumping system

Abstract

The application discloses a tunnel sewage pumping system, aiming at solving the technical problem that the lowest point of the tunnel box culvert cannot be self-flowing discharged. By integrating the submersible pump, the sewage tank, the sewage pump and the control electric box, the automatic pumping of the lowest point of the tunnel box culvert is realized. The system adopts the redundancy design of the double submersible pump and the double horizontal sewage pump, cooperates with the sewage liquid level sensor and the accumulated water liquid level sensor, realizes the accurate control of the pump start and stop while responding to the water level change in real time. In addition, the control electric box has manual control and automatic control dual modes, can adjust the working speed of the sewage pump through the frequency converter, effectively improves the reliability, adaptability and energy efficiency of the system, reduces the manual intervention, and guarantees the continuous and stable operation of the tunnel drainage.

Description

Technical Field

[0001] This application relates to the field of tunnel drainage technology, specifically to a tunnel sewage pumping system. Background Technology

[0002] During tunnel construction or operation, especially in V-shaped tunnels using the shield tunneling method to lay box culvert structures, the V- or W-shaped longitudinal slope of the tunnel makes it prone to accumulating construction wastewater at the lowest point. Traditional drainage methods mainly rely on gravity drainage based on natural slopes. However, at the lowest point of the tunnel's longitudinal slope, a natural drainage slope cannot be formed, making it difficult for water to drain automatically and easily leading to the risk of water accumulation. If water accumulates at the lowest point of the tunnel for a long time, it may soak the box culvert foundation, affecting structural stability and even causing settlement or leakage problems. In addition, the accumulated water may carry impurities such as silt and construction waste slurry, which may block existing drainage channels after sedimentation.

[0003] Current drainage methods generally rely on manual pumping, which is inefficient and cannot respond to water level changes in real time, easily leading to untimely drainage. In addition, the inventors also know of a method for pumping out accumulated water by setting up a fixed pumping station, but the drainage equipment is bulky, complicated to install, and cannot be adapted to the environment of limited space inside the box culvert.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the background technology of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] In view of at least one of the above technical problems, this application discloses a tunnel sewage pumping system, which aims to solve the technical problem that water accumulated at the lowest point inside the tunnel box culvert cannot be discharged by gravity.

[0006] According to one aspect of this disclosure, a tunnel sewage pumping system is provided, comprising a sewage tank fixed to the top of a tunnel culvert, two submersible pumps located at a water accumulation point inside the tunnel culvert and connected to the sewage tank via corresponding pipelines, a sewage pump located in a connecting pipeline between the sewage tank and the tunnel sewage pipe, a sewage level sensor located inside the sewage tank for monitoring changes in the sewage tank level, a water accumulation level sensor located at a water accumulation point inside the tunnel culvert for monitoring changes in the water level at the water accumulation point, a frequency converter electrically connected to the corresponding sewage pump for controlling the speed of the sewage pump, and a control circuit for controlling the start and stop of the submersible pump and the corresponding sewage pump; the control circuit includes an automatic control circuit and a manual control circuit.

[0007] In some embodiments of this disclosure, the sewage pump includes two horizontal sewage pumps fixed to the top of the tunnel culvert and located on both sides of the sewage tank.

[0008] In some embodiments of this disclosure, the control circuit is located inside a control box, which includes a box body fixed to the top of the tunnel culvert and a control panel located on the outer surface of the box body and electrically connected to the control circuit.

[0009] In some embodiments of this disclosure, the automatic control circuit includes a main control circuit, a sewage pump automatic circuit, a submersible pump I automatic circuit, and a submersible pump II automatic circuit connected in parallel. The main control circuit includes an emergency stop button connected in series, a normally open sewage tank low-level switch that opens and closes based on sewage level sensor data, a sewage tank low-level relay control terminal, a rotary switch for switching between automatic and manual control, and a manual circuit relay control terminal. The sewage pump automatic circuit includes a normally open manual circuit relay, a normally open sewage tank low-level relay, a packing flushing relay control terminal for flushing the sewage pump, and a sewage pump control branch for regulating the frequency converter. The sewage pump control branch includes a low-speed branch, a medium-speed branch, and a high-speed branch connected in parallel.

[0010] In some embodiments of this disclosure, the low-speed branch includes a low-level normally open switch and a low-level normally closed switch connected in series, which are respectively opened and closed based on the sewage level sensor level data; a low-speed relay control terminal; a medium-speed normally closed operating terminal; and a low-speed normally open operating terminal connected in parallel across the low-level normally open switch. The medium-speed branch includes a medium-level normally open switch and a medium-level normally closed switch connected in series, which are respectively opened and closed based on the sewage level sensor level data; a medium-speed relay control terminal; a low-speed normally closed operating terminal; a high-speed normally closed operating terminal; and a high-speed normally open operating terminal connected in parallel across the medium-level normally open switch.

[0011] In some embodiments of this disclosure, the automatic circuit of the submersible pump one includes a low-level normally open switch two and a low-level normally closed switch two connected in series, which are respectively opened and closed based on the liquid level data of the water level sensor; a control terminal of the pump power relay one for controlling the submersible pump one; and an operating terminal of the pump power relay one connected in parallel across the low-level normally open switch two. The automatic circuit of the submersible pump two includes a high-level normally open switch two and a high-level normally closed switch two connected in series, which are respectively opened and closed based on the liquid level data of the water level sensor; a control terminal of the pump power relay two for controlling the submersible pump two; and an operating terminal of the pump power relay two connected in parallel across the high-level normally open switch two.

[0012] In some embodiments of this disclosure, the manual control circuit includes a manual circuit relay actuation terminal for controlling the opening and closing of the manual control circuit. The manual control circuit also includes a low-speed manual circuit for the sewage pump, a medium-speed manual circuit for the sewage pump, a high-speed manual circuit for the sewage pump, a first manual circuit for the submersible pump, and a second manual circuit for the submersible pump, all connected in parallel.

[0013] In some embodiments of this disclosure, the low-speed manual circuit of the sewage pump includes a voltage relay control terminal, a low-speed manual start button, a low-speed manual relay control terminal, a low-speed manual stop button, and a low-speed normally open actuating terminal three connected in parallel across the voltage relay and the low-speed manual start button; the medium-speed manual circuit of the sewage pump includes a low-speed normally open actuating terminal two, a medium-speed manual start button, a medium-speed manual relay control terminal, a medium-speed manual stop button, and a medium-speed normally open actuating terminal three connected in parallel across the low-speed normally open actuating terminal two and the medium-speed manual control button; the high-speed manual circuit of the sewage pump includes a medium-speed normally open actuating terminal two, a high-speed manual start button, a high-speed manual relay control terminal, a high-speed manual stop button, and a high-speed normally open actuating terminal three connected in parallel across the medium-speed normally open actuating terminal two and the high-speed manual start button.

[0014] In some embodiments of this disclosure, the first manual circuit of the submersible pump includes a first manual start button, a first manual relay control terminal, a first manual stop button, and a first normally open actuating terminal of the submersible pump connected in series; the second manual circuit of the submersible pump includes a second manual start button, a second manual relay control terminal, a second manual stop button, and a second normally open actuating terminal of the submersible pump connected in parallel.

[0015] One or more technical solutions provided in this application embodiment have at least one of the following technical effects or advantages: By integrating submersible pumps, sewage tanks, sewage pumps, and control boxes, automated pumping of water accumulated at the lowest point inside the tunnel culvert is achieved. The system adopts a redundant design of dual submersible pumps and dual horizontal sewage pumps, combined with sewage level sensors and water level sensors, to respond to water level changes in real time and achieve precise control of pump start-up and shutdown. In addition, the control box has both manual and automatic control modes, and can adjust the working speed of the sewage pumps through a frequency converter, effectively improving the system's reliability, adaptability, and energy efficiency, while reducing manual intervention and ensuring continuous and stable operation of tunnel drainage. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a tunnel sewage pumping system in one embodiment of this application.

[0017] Figure 2 This is a pipeline connection diagram of a tunnel sewage pumping system in one embodiment of this application.

[0018] Figure 3 This is an electrical schematic diagram of the automatic control circuit of a tunnel sewage pumping system in one embodiment of this application.

[0019] Figure 4 This is an electrical schematic diagram of the manual control circuit of a tunnel sewage pumping system in one embodiment of this application.

[0020] Figure 5 This is a wiring diagram of submersible pump 1, submersible pump 2, and sewage pump of a tunnel sewage pumping system according to one embodiment of this application.

[0021] In the above diagrams, 1 is the sewage tank, 2 is the sewage pump, 3 is the control box, 4 is submersible pump one, 5 is submersible pump two, 6 is the water level sensor, 7 is the sewage level sensor, 8 is the main control circuit, 9 is the automatic circuit for submersible pump one, 10 is the automatic circuit for submersible pump two, 11 is the automatic circuit for the sewage pump, 12 is the low-speed branch circuit, 13 is the medium-speed branch circuit, 14 is the high-speed branch circuit, 15 is the low-speed manual circuit for the sewage pump, 16 is the medium-speed manual circuit for the sewage pump, 17 is the high-speed manual circuit for the sewage pump, 18 is the manual circuit for submersible pump one, 19 is the manual circuit for submersible pump two, 20 is the tunnel sewage pipe, 21 is the frequency converter, 22 is pump power supply one, 23 is pump power supply two, and 24 is the transformer. Detailed Implementation

[0022] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "vertical," "horizontal," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "connection" and "linkage" in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0023] Unless otherwise specified, the unit modules, components, structures, mechanisms, or sensors involved in the following embodiments are all commercially available products.

[0024] To better understand the technical solution of this application, the above technical solution will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] To address the technical problem of water accumulation at the lowest point inside a tunnel culvert failing to drain due to gravity, this embodiment discloses an automatic sewage pumping system for tunnels, such as... Figure 1As shown, it includes a sewage tank 1, a submersible pump and a sewage pump 2, and a control box 3.

[0026] like Figure 2 As shown, in this embodiment, the water accumulated at the lowest point inside the tunnel culvert is pumped out by a submersible pump and discharged outside the tunnel through the tunnel sewage pipe 20. Since the distance between the water accumulation point and the tunnel sewage pipe 20 is relatively far, to avoid energy loss caused by direct long-distance pumping, a sewage tank 1 is fixed at the top of the tunnel culvert as a temporary storage unit, increasing the sewage discharge distance. Furthermore, considering that the accumulated water may carry impurities such as silt and construction waste, ordinary submersible pumps are difficult to adapt to high-solids-content sewage environments and are easily clogged or worn by silt. Therefore, two horizontal sewage pumps 2 are placed at the top of the tunnel culvert and on both sides of the culvert, with one end connected to the sewage tank 1 and the other end connected to the tunnel sewage pipe 20, greatly improving sewage discharge efficiency.

[0027] When submersible pumps are used to pump out water from the lowest point inside a tunnel culvert, a failure of a single submersible pump can lead to the inability to remove the water in time, causing the culvert foundation to be soaked, which in turn affects the stability of the tunnel structure and may even cause settlement or leakage. Therefore, the submersible pumps include submersible pump 4 and submersible pump 5, which are connected to the sewage tank through corresponding pipelines. Combined with the buffer of sewage tank 1, the continuity of the entire system is ensured.

[0028] To achieve control over the entire system, such as Figure 2 As shown, the control box 3 includes a box body, a control panel located on the outer surface of the box body, and a control circuit located inside the box body and connected to the power supply. However, when controlling the submersible pump and the sewage pump, the changes in liquid level at the water accumulation point in the tunnel culvert and inside the sewage tank must be considered. To achieve automatic monitoring of the liquid level at the water accumulation point in the tunnel culvert and inside the sewage tank, in this embodiment, a water level sensor 6 is installed at the water accumulation point inside the tunnel culvert, and a sewage level sensor 7 is installed inside the sewage tank 1. Preferably, the water level sensor 6 is a level sensor with high and low contacts, and the sewage level sensor 7 is a level sensor with high, medium, and low contacts. Simultaneously, to adapt to different liquid levels and pumping requirements inside the sewage tank 1, the two horizontal sewage pumps are connected to frequency converters. The starting speed of the pumps can be controlled by the frequency converters according to the changes in the liquid level inside the sewage tank 1, thereby improving sewage discharge efficiency.

[0029] Furthermore, considering that the control of submersible pumps and sewage pumps largely relies on manual operation, making unattended drainage impossible, in addition to the manual control of the submersible pumps and sewage pumps, automatic control of the corresponding pumps via level sensors is also required. Specifically, in this embodiment, as... Figure 3 , 4As shown, the control loop includes a manual control loop and an automatic control loop, realizing an automatic monitoring and pump control linkage mechanism to respond to water level changes in real time. In addition, to enable manual and automatic control of the entire system from the control box, specifically in this embodiment, the control panel is equipped with start and stop buttons for submersible pump one, start and stop buttons for submersible pump two, low-speed start and stop buttons for the sewage pump, medium-speed start and stop buttons for the sewage pump, high-speed start and stop buttons for the sewage pump, and a rotary switch. The rotary switch has three positions: automatic, stop, and manual, facilitating control of the entire system's operating mode. Furthermore, to ensure equipment and personnel safety and prevent malfunctions, the control panel also includes an emergency stop button.

[0030] Therefore, in this embodiment, in order to achieve the above control, the circuit design of the control loop is as follows:

[0031] To achieve switching between manual and automatic control loops, such as Figure 3 As shown, the automatic control circuit includes a main control circuit 8, a sewage pump automatic control circuit 11, a submersible pump I automatic circuit 9, and a submersible pump II automatic circuit 10, all connected in parallel. The main control circuit 8 includes an emergency stop button SB, a rotary switch SA, and a manual circuit relay K1 connected in series. To allow the rotary switch SA to switch between manual and automatic control circuits, the sewage pump automatic control circuit 11 includes a normally open contact K1 of the manually connected manual circuit relay K1. A manual circuit switch SB0, controlled by the manually connected circuit relay K1, is provided on the power supply circuit of the manual control circuit. Therefore, when the rotary switch is switched to the manual position, the manually connected circuit relay controls the manually connected circuit switch SB0 to close, and the system is connected to the manual control circuit; when the rotary switch is switched to the automatic position, the normally open contact K1 of the manually connected circuit relay controller K1 closes, and the system is connected to the automatic control circuit. Considering the possibility of the sewage pump damaging itself due to dry running when there is no water in the sewage tank, the main control circuit 8 also includes a sewage tank low-level switch LS and a sewage tank low-level relay KM1 connected in series based on the sewage level data from the sewage level sensor 7. Therefore, when the sewage level in sewage tank 1 falls below the low level of the sewage level sensor, the main control circuit 8 is not powered on and cannot control the connection of the manual and automatic control circuits, thus stopping the system.

[0032] When the rotary switch is set to automatic, such as Figure 3 , 4As shown, in this embodiment, the automatic control circuit 9 for submersible pump one and the automatic circuit 10 for submersible pump two are connected. Specifically, the automatic circuit 9 for submersible pump one includes a normally open low-level switch LS1 connected in series based on the liquid level data from the water level sensor 6, a normally closed low-level switch LS2 controlled by the water level sensor 6, and a pump relay K2 for controlling submersible pump one; wherein, as Figure 5 As shown, submersible pump 4 is started and stopped by pump control 1, and to form a self-locking mechanism, the two ends of the low-level normally open switch LS1, controlled by the water level sensor 6, are connected in parallel to the input point K2 of the pump control 1 relay. The automatic circuit 10 of submersible pump 2 is connected in series with the high-level normally open switch LS3, controlled by the water level sensor 6; the high-level normally closed switch LS4, controlled by the water level sensor 6; and the pump control 2 relay K3, used to control submersible pump 2; wherein, as... Figure 5 As shown, submersible pump 25 is started and stopped by pump control 2, and to form a self-locking mechanism, the two ends of the high-level normally open switch LS3 controlled by the water level sensor 6 are connected in parallel to the input point K3 of the pump control 2 relay. Specifically, when the rotary switch SA is adjusted to the automatic position, when the water level in the tunnel culvert reaches the low level of the water level sensor 6, the low-level normally open switch LS1 on the automatic circuit 9 of submersible pump 1 closes, the pump control 2 relay K2 is energized, and the input point K2 of the pump control 2 relay closes to form a self-locking mechanism, and submersible pump 4 starts; when the water level exceeds the high level of the water level sensor 6, the high-level normally open switch LS3 on the control circuit 10 of submersible pump 2 closes, the pump control 2 relay K3 is energized, the input point K3 of the pump control 2 relay closes to form a self-locking mechanism, and submersible pump 25 starts. At this time, submersible pump 4 and submersible pump 25 work simultaneously. When the water level at the accumulation point drops to the low or high level of the water level sensor 6, the normally closed low level switch LS2 or normally closed high level switch LS4 on the automatic circuit 9 of submersible pump 1 and the automatic circuit 10 of submersible pump 2 are disconnected, thereby controlling submersible pump 4 and submersible pump 2 to stop working respectively.

[0033] To achieve automatic control of the sewage pump speed, further, such as Figure 3 , 4As shown, the sewage pump automatic circuit 11 also includes an input point KM1 of the sewage tank low level relay, which is connected in series based on the sewage level data of the sewage level sensor 7, a packing flushing relay KM2, and the sewage pump automatic circuit. The packing flushing relay KM2 controls the packing inside the sewage pump 2 to flush, preventing sewage from entering the bushing from the packing and causing wear. Specifically, the sewage pump automatic circuit includes a low-speed branch 12, a medium-speed branch 13, and a high-speed branch 14 connected in parallel. The low-speed branch 12 includes a normally open low-level switch LS5 that opens and closes based on the level data of the sewage level sensor 7, a normally closed low-level switch LS6 that opens and closes based on the level data of the sewage level sensor 7, a low-speed automatic relay K4 for the sewage pump, and a normally closed medium-speed input point K5 controlled by the medium-speed automatic relay K5 for the sewage pump. Preferably, the two ends of the normally open low-level switch LS5 are connected in parallel with a normally open low-speed input point K4 controlled by the low-speed automatic relay K4 for the sewage pump, which plays a self-locking role to prevent the sewage pump from constantly switching between starting and stopping due to level fluctuations. The medium-speed branch 13 includes a medium-level normally open switch LS7 that opens and closes based on the level data of the sewage level sensor 7, a medium-level normally closed switch LS8 that opens and closes based on the level data of the sewage level sensor 7, a sewage pump medium-speed automatic relay K5, a low-speed normally closed input point K4 controlled by a sewage pump low-speed automatic relay K4, and a high-speed normally closed input point K6 controlled by a sewage pump high-speed automatic relay K6; preferably, a medium-speed normally open input point K5 controlled by a sewage pump medium-speed automatic relay K5 is connected in parallel across the two ends of the medium-level normally open switch LS7. The high-speed branch 14 includes a high-level normally open switch LS9, a high-level normally closed switch LS10, a high-level normally closed switch LS10, a high-speed automatic relay K6 for the sewage pump, and a medium-speed normally closed input point K6 controlled by the medium-speed automatic relay K6 for the sewage pump, connected in series. Preferably, a high-speed normally open input point K6 controlled by the high-speed automatic relay K6 for the sewage pump is connected in parallel across the high-level normally open switch LS9. Specifically, when the sewage level in the sewage tank 1 exceeds the low level, the automatic control circuit is energized, and the sewage pump 2 first performs packing flushing. When the sewage level in the sewage tank 1 is low, the low-speed branch 12 is activated to start the sewage pump at low speed. When the sewage level in the sewage tank 1 is high, the medium-speed branch 13 is activated and the low-speed branch 12 is deactivated. When the sewage level in the sewage tank 1 is high, the high-speed branch 14 is activated and the medium-speed branch 13 is deactivated. When the sewage level in the sewage tank drops and returns to the medium or low level, the medium-speed automatic branch 13 is activated or the low-speed automatic branch 12 is activated automatically, the high-speed automatic branch 14 is activated, and the medium-speed automatic branch 13 is deactivated in sequence.

[0034] To achieve manual control, such as Figure 4As shown, the manual control circuit includes parallel-connected low-speed manual circuit 15 for sewage pumps, medium-speed manual circuit 16 for sewage pumps, high-speed manual circuit 17 for sewage pumps, manual circuit 18 for submersible pump one, and manual circuit 19 for submersible pump two. Specifically, the low-speed manual circuit 15 for sewage pumps includes a voltage relay KV1, a low-speed manual start button SB1 for sewage pumps, a low-speed manual relay KA1 for sewage pumps, and a low-speed manual stop button SB6 for sewage pumps, connected in series. To form a self-locking mechanism for low-speed start of the sewage pump, a normally open switch KA1 (1,5) controlled by the low-speed manual relay KA1 is connected in parallel across the voltage relay KV1 and the low-speed manual start button SB1. The sewage pump medium-speed manual circuit 16 includes, in series, a second normally open switch KA1 (2, 6) controlled by the sewage pump low-speed manual relay KA1, a sewage pump medium-speed manual start button SB2, a sewage pump medium-speed manual relay KA2, and a sewage pump medium-speed manual stop button SB7. To establish a self-locking mechanism for medium-speed start, a third normally open switch KA2 (1, 5) controlled by the sewage pump medium-speed manual relay KA2 is connected in parallel across the two ends of the second normally open switch KA1 (2, 6) and the sewage pump medium-speed manual control button SB2. The sewage pump high-speed manual circuit 17 includes, in series, a second normally open switch KA2 (2, 6) controlled by the sewage pump medium-speed manual relay KA2, a sewage pump high-speed manual start button SB3, a sewage pump high-speed manual relay KA3, and a sewage pump high-speed manual stop button SB8. To establish a self-locking mechanism for high-speed start, a third normally open switch KA3 (1, 5) controlled by the sewage pump high-speed manual relay KA3 is connected in parallel across the two ends of the second normally open switch KA2 (2, 6) and the sewage pump high-speed manual start button SB3. In addition, to achieve manual control of the submersible pump, in this embodiment, such as Figure 4 As shown, specifically, the submersible pump manual circuit 18 includes a submersible pump manual start button SB4, a submersible pump manual relay KA4, and a submersible pump manual stop button SB9 connected in series. To establish a self-locking mechanism for submersible pump start, a normally open switch KA4(1,5) controlled by the submersible pump manual relay KA4 is connected in parallel across the submersible pump manual start button SB4. The submersible pump manual circuit 19 includes a submersible pump manual start button SB5, a submersible pump manual relay KA5, and a submersible pump manual stop button SB10 connected in series. To establish a self-locking mechanism for submersible pump start, a normally open switch KA5(1,5) controlled by the submersible pump manual relay KA5 is connected in parallel across the submersible pump manual start button SB5.

[0035] In addition, in order to achieve control of the sewage pump speed, such as Figure 5As shown, the frequency converter is equipped with normally open contacts K4 for the low-speed automatic relay of the sewage pump, normally open contacts K5 for the medium-speed automatic relay of the sewage pump, and normally open contacts K6 for the high-speed automatic relay of the sewage pump, thereby realizing the control of the speed of the sewage pump through the frequency converter.

[0036] Although some preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0037] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A tunnel sewage pumping system, characterized by, The system includes a sewage tank fixed to the top of the tunnel culvert, two submersible pumps located inside the tunnel culvert at the water accumulation point and connected to the sewage tank via corresponding pipelines, a sewage pump located in the connecting pipeline between the sewage tank and the tunnel sewage pipe, a sewage level sensor located inside the sewage tank to monitor changes in the sewage tank level, a water accumulation level sensor located inside the tunnel culvert at the water accumulation point to monitor changes in the water level at the water accumulation point, a frequency converter electrically connected to the corresponding sewage pump to control the speed of the sewage pump, and a control circuit for controlling the start and stop of the submersible pump and the corresponding sewage pump; the control circuit includes an automatic control circuit and a manual control circuit.

2. The tunnel sewage pumping system according to claim 1, characterized in that, The sewage pumps include two horizontal sewage pumps fixed to the top of the tunnel culvert and located on both sides of the sewage tank.

3. The tunnel sewage pumping system according to claim 1, characterized in that, The control circuit is located inside the control box, which includes a box body fixed to the top of the tunnel culvert and a control panel located on the outer surface of the box body and electrically connected to the control circuit.

4. The tunnel sewage pumping system according to claim 1, characterized in that, The automatic control circuit includes a main control circuit, a sewage pump automatic circuit, a submersible pump I automatic circuit, and a submersible pump II automatic circuit connected in parallel. The main control circuit includes an emergency stop button connected in series, a normally open sewage tank low-level switch that opens and closes based on sewage level sensor data, a sewage tank low-level relay control terminal, a rotary switch for switching between automatic and manual control, and a manual circuit relay control terminal. The sewage pump automatic circuit includes a normally open manual circuit relay, a normally open sewage tank low-level relay, a packing flushing relay control terminal for flushing the sewage pump, and a sewage pump control branch for regulating the frequency converter. The sewage pump control branch includes a low-speed branch, a medium-speed branch, and a high-speed branch connected in parallel.

5. The tunnel sewage pumping system according to claim 4, characterized in that, The low-speed branch includes a series-connected low-level normally open switch and a low-level normally closed switch, which are respectively opened and closed based on the sewage level sensor level data; a low-speed relay control terminal; a medium-speed normally closed operating terminal; and a low-speed normally open operating terminal connected in parallel across the low-level normally open switch. The medium-speed branch includes a series-connected medium-level normally open switch and a medium-level normally closed switch, which are respectively opened and closed based on the sewage level sensor level data; a medium-speed relay control terminal; a low-speed normally closed operating terminal; a high-speed normally closed operating terminal; and a high-speed normally open operating terminal connected in parallel across the medium-level normally open switch.

6. The tunnel sewage pumping system according to claim 5, characterized in that, The automatic circuit of submersible pump one includes a low-level normally open switch two and a low-level normally closed switch two connected in series, which are respectively opened and closed based on the liquid level data of the water level sensor; a control terminal of the pump power relay one for controlling submersible pump one; and an operating terminal of the pump power relay one connected in parallel across the low-level normally open switch two. The automatic circuit of submersible pump two includes a high-level normally open switch two and a high-level normally closed switch two connected in series, which are respectively opened and closed based on the liquid level data of the water level sensor; a control terminal of the pump power relay two for controlling submersible pump two; and an operating terminal of the pump power relay two connected in parallel across the high-level normally open switch two.

7. The tunnel sewage pumping system according to claim 6, characterized in that, The manual control circuit includes a manual circuit relay actuation terminal for controlling the opening and closing of the manual control circuit. The manual control circuit also includes a low-speed manual circuit for sewage pumps, a medium-speed manual circuit for sewage pumps, a high-speed manual circuit for sewage pumps, a first manual circuit for submersible pumps, and a second manual circuit for submersible pumps, all connected in parallel.

8. The tunnel sewage pumping system according to claim 7, characterized in that, The low-speed manual circuit of the sewage pump includes a voltage relay control terminal, a low-speed manual start button, a low-speed manual relay control terminal, a low-speed manual stop button, and a low-speed normally open actuating terminal three connected in parallel across the voltage relay and the low-speed manual start button; the medium-speed manual circuit of the sewage pump includes a low-speed normally open actuating terminal two, a medium-speed manual start button, a medium-speed manual relay control terminal, a medium-speed manual stop button, and a medium-speed normally open actuating terminal three connected in parallel across the low-speed normally open actuating terminal two and the medium-speed manual control button; the high-speed manual circuit of the sewage pump includes a medium-speed normally open actuating terminal two, a high-speed manual start button, a high-speed manual relay control terminal, a high-speed manual stop button, and a high-speed normally open actuating terminal three connected in parallel across the medium-speed normally open actuating terminal two and the high-speed manual start button.

9. The tunnel sewage pumping system according to claim 8, characterized in that, The submersible pump manual circuit includes a submersible pump manual start button, a submersible pump manual relay control terminal, a submersible pump manual stop button connected in series, and a submersible pump normally open actuating terminal connected in parallel across the submersible pump manual start button; the submersible pump manual circuit includes a submersible pump manual start button, a submersible pump manual relay control terminal, a submersible pump manual stop button connected in series, and a submersible pump normally open actuating terminal connected in parallel across the submersible pump manual start button.

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