A new residual water discharge system

Abstract

The application relates to the technical field of residual water shore discharge, and discloses a novel residual water shore discharge system, which comprises a residual water cabin, a liquid level detection module, a mud pump, a variable frequency driving module and a flow rate detection module. The residual water cabin is used for storing residual water allocated from other parts. The liquid level detection module is used for monitoring the water level in the residual water cabin in real time, and information about water level change is transmitted to the system. The system uses at least two mud pumps which are installed in the side cabin and are responsible for discharging residual water from the residual water cabin to the shore. The variable frequency driving module is connected with and drives the motor of the mud pump. By adjusting the rotating speed of the motor, the variable frequency driving module can realize different working modes, including single-pump and double-pump working modes. The main purpose is to adjust the rotating speed of the pump according to the real-time flow rate, so as to ensure that the drainage flow rate is within a reasonable range and the conditions of being too fast or too slow are avoided.

Description

Technical Field

[0001] This application relates to the field of wastewater drainage technology, and in particular to a novel wastewater drainage system. Background Technology

[0002] In fields such as water conservancy projects, ship maintenance, and industrial wastewater treatment, wastewater drainage systems are crucial facilities for ensuring timely drainage of accumulated water and preventing equipment or areas from being flooded. Existing wastewater drainage systems generally suffer from the following technical defects: During the rainy season in the Taihu Lake area, traditional systems often experience pipe rupture due to the impact of high flow velocities because they cannot dynamically adjust the flow rate; during the dry season when the liquid level is low, insufficient pressure from a single pump prevents wastewater from being discharged to the shore, requiring frequent manual intervention and resulting in low operation and maintenance efficiency.

[0003] Most systems only trigger pump start-up and shutdown based on liquid level signals, lacking dynamic response to real-time flow velocity. This easily leads to problems such as "excessive flow velocity at high liquid levels causing pipeline impact, and insufficient flow velocity at low liquid levels causing insufficient discharge distance." The pump mode switching is rigid. Dual-pump systems often adopt the mode of "manually switching to the standby pump after a single pump failure," which has a long switching response time (usually >10 seconds). Fixed-speed pumps consume more energy when operating under non-rated conditions, and long-term high-flow-velocity impact or low-flow-velocity idling can easily lead to pump wear, increasing maintenance costs and failure risks.

[0004] Therefore, there is an urgent need for a new type of wastewater discharge system that can achieve liquid level-flow velocity linkage control and adaptive adjustment of pump group mode to solve the compatibility and stability problems of existing technologies. Utility Model Content

[0005] To address the aforementioned problems, this application provides a novel wastewater drainage system.

[0006] The novel wastewater drainage system provided in this application adopts the following technical solution: A novel wastewater discharge system includes: a wastewater tank for storing and allocating wastewater; a liquid level detection module installed in the wastewater tank for detecting the liquid level in the wastewater tank and sending a liquid level signal; at least two mud pumps installed in a side tank for discharging wastewater from the wastewater tank to the bank; a frequency converter drive module connected to the mud pumps for driving the mud pumps and adjusting the motor speed of the mud pumps; and a flow velocity detection module for real-time detection of the flow velocity during wastewater discharge and sending a flow velocity signal.

[0007] The liquid level detection module has a measurement range of 0-3m and an accuracy of ±0.01m; the mud pump has a head of 30-50m and a flow rate of 50-100m³ / h; the flow velocity detection module is installed 1.5m from the pump body on the pump outlet pipe.

[0008] Furthermore, it also includes a control module connected to the liquid level detection module, the frequency conversion drive module, and the flow rate detection module respectively. The control module is used to receive liquid level signals and flow rate signals, and control the frequency conversion drive module to adjust the operating status of the mud pump according to the signals.

[0009] Furthermore, the control module is configured to: when the liquid level detection module detects that the liquid level has risen to a preset threshold, control the frequency converter drive module to start the single pump discharge mode and drive a mud pump to run.

[0010] Furthermore, the control module is also configured to: receive the flow velocity signal sent by the flow velocity detection module in the single pump discharge mode, and control the frequency conversion drive module to reduce the motor speed of the corresponding mud pump when the flow velocity exceeds the preset upper limit of the flow velocity.

[0011] Furthermore, the control module is also configured to: in single-pump bank discharge mode, receive the flow velocity signal sent by the flow velocity detection module, and when the flow velocity is lower than the preset reasonable flow velocity lower limit, control the frequency conversion drive module to increase the motor speed of the corresponding mud pump to the rated speed.

[0012] Furthermore, the control module is also configured to: in single-pump discharge mode, when the flow rate of the mud pump is still lower than the preset reasonable flow rate lower limit when the mud pump is running at the rated speed, control the frequency conversion drive module to start the dual-pump series mode, drive the two mud pumps to run in series to increase the discharge pressure and discharge distance. The dual-pump series mode is realized through series pipelines and pressure balancing valves. The pressure balancing valves are used to prevent backflow between the mud pumps.

[0013] In the above embodiments, the preset liquid level threshold is set to 2.0m, and the reasonable flow rate range is set to 3-4m / s. Furthermore, the two mud pumps are in a backup mode for each other. When one of the mud pumps fails, the control module controls the frequency converter drive module to switch to the operation of the other mud pump.

[0014] In summary, this application includes the following beneficial technical effects: By employing a "dual-parameter linkage control of liquid level and flow rate" logic, an upgrade from "passive start-stop" to "active adaptation" has been achieved. When the flow rate is too high, it automatically reduces the speed to avoid pipeline impact; when the flow rate is too low, it automatically increases the speed or switches to a dual-pump series mode. This solves the problems of unstable flow rate and insufficient discharge distance in traditional systems, improving the discharge efficiency by more than 30%.

[0015] The variable frequency drive module dynamically adjusts the speed according to the operating conditions, reducing energy consumption under non-rated operating conditions; at the same time, due to the stable flow rate and pressure, the maintenance frequency of pipelines and pump sets is reduced, thus lowering maintenance costs. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the structure of a novel wastewater drainage system according to this utility model.

[0017] Explanation of reference numerals in the attached diagram: 1. Excess water tank; 2. Liquid level detection module; 3. Mud pump; 4. Variable frequency drive module; 5. Flow rate detection module; 6. Control module; 7. Series pipeline; 8. Pressure balancing valve. Detailed Implementation

[0018] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0019] The applicant argues that in rainy and topographically complex environments like the Taihu Lake region, traditional wastewater drainage systems often suffer from large fluctuations in water level and unstable drainage distances, leading to wastewater accumulation or pipeline overload and impacting overall operational efficiency. Therefore, a novel wastewater drainage system capable of achieving integrated water level and flow rate control and adaptive pump group adjustment is urgently needed to address the compatibility and stability issues of existing technologies.

[0020] This application discloses a novel wastewater drainage system. (Refer to...) Figure 1 The system includes: a residual water tank 1, a liquid level detection module 2, a mud pump 3, a variable frequency drive module 4, and a flow rate detection module 5. The residual water tank 1 stores residual water transferred from other parts. The liquid level detection module 2 monitors the water level in the residual water tank 1 in real time and transmits information about water level changes to the system. The system uses at least two mud pumps 3, installed in the side tanks, responsible for discharging residual water from the residual water tank 1 to the shore. The variable frequency drive module 4 connects to and drives the motors of the mud pumps 3. By adjusting the motor speed, the variable frequency drive module 4 can achieve different operating modes, including single-pump and dual-pump operating modes. Its main purpose is to adjust the pump speed according to the real-time flow rate to ensure that the drainage flow rate is within a reasonable range, avoiding situations that are too fast or too slow. The flow rate detection module 5 monitors the drainage flow rate in real time and feeds the data back to the system. Based on this flow rate information, the operating state of the mud pumps 3 is adjusted. If the flow rate is too high, the motor speed will decrease; if the flow rate is too low, the motor speed will increase. The system can also switch to a dual-pump operating mode to increase drainage pressure and ensure sufficient discharge distance; the dual-pump series mode is achieved through a dedicated series pipeline and a pressure balancing valve, which is used to prevent backflow between pumps.

[0021] In the above embodiment, a control module 6 is further included. The control module 6 receives the liquid level signal from the liquid level detection module 2 and determines whether the liquid level of the residual water tank 1 has reached a preset limit. When the liquid level reaches a certain value, the control module 6 will automatically start the system's drainage operation.

[0022] Flow velocity signal processing: The control module 6 also receives signals from the flow velocity detection module 5 to monitor the flow velocity during drainage in real time. Based on the flow velocity signal, the control module 6 can determine the current drainage efficiency and whether the speed of the mud pump 3 needs to be adjusted.

[0023] Adjusting the operating status of mud pump 3: Based on the liquid level and flow rate signals, control module 6 is responsible for adjusting frequency conversion drive module 4, thereby adjusting the motor speed of mud pump 3. Frequency conversion drive module 4 has a speed range of 5-50Hz, an output power of 15kW, and a protection level of IP65, which is suitable for the stepless speed regulation requirements of the motor of mud pump 3.

[0024] Specifically: If the flow rate is too high, control module 6 will reduce the motor speed of mud pump 3 to ensure that the drainage flow does not exceed the set reasonable range. If the flow rate is too low, control module 6 will increase the motor speed to improve drainage efficiency and ensure that the flow rate meets the requirements. If a single pump cannot meet the demand, control module 6 will switch to a dual-pump series mode to increase drainage pressure and optimize the discharge distance.

[0025] In actual use, in single-pump drainage mode, control module 6 first ensures that mud pump 3 operates at its rated speed. If the drainage flow rate is still lower than the preset reasonable flow rate limit, it indicates that the drainage capacity of the single pump has reached its limit and cannot meet the drainage requirements. When the flow rate is too low and the single pump cannot effectively increase the flow rate, control module 6 will automatically switch to dual-pump series mode. In this mode, two mud pumps 3 operate in series, increasing drainage efficiency by increasing drainage pressure and drainage distance. The coordinated operation of the two pumps can significantly improve the drainage capacity of the entire drainage system. The series operation of the two pumps not only increases the flow rate but also increases the drainage pressure under different working conditions, thereby ensuring that the residual water can be smoothly discharged to the predetermined shore. It is suitable for situations where the requirements cannot be met in single-pump mode, automatically starting the coordinated operation of the two pumps to maintain the high efficiency of the system. It is suitable for scenarios with large liquid level fluctuations and complex shore environments, such as the Taihu Lake area, and can cope with the rapid drainage needs of high liquid levels during the rainy season and solve the problem of insufficient drainage distance at low liquid levels during the dry season. Its applicable scope covers a variety of residual water shore drainage conditions.

[0026] This system improves the shoreline drainage efficiency by 35% under rainy season conditions in the Taihu Lake area, increases the hourly drainage capacity of the single pump mode from 150m³ to 200m³, and reduces energy consumption under non-rated conditions by 28%.

[0027] In actual use, the electrical control logic adopted by control module 6 is as follows: after being protected by a fuse, 220V AC power supply is used to power control module 6 (PLC controller) and frequency converter controller respectively; the liquid level sensor and flow rate sensor transmit 4-20mA analog signals to the PLC controller to realize real-time data acquisition; the PLC controller controls the start and stop of the frequency converter and the switching of working modes through digital output, and drives the pressure balance valve solenoid valve; the frequency converter adjusts the output frequency according to the control signal to control the speed of the mud pump 3 motor, and realizes the single pump / dual pump mode switching through the contactor.

[0028] In actual use, the control module 6 adopts an S7-1200 series PLC controller, which supports 4 analog inputs (receiving 4-20mA liquid level / flow rate signals) and 8 digital outputs for controlling pump group mode switching.

[0029] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other. Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0030] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A novel wastewater drainage system, characterized in that, include: The surplus water tank is used to store surplus water that has been allocated. A liquid level detection module is installed inside the residual water tank to detect the liquid level inside the residual water tank and send a liquid level signal; At least two mud pumps are provided; the two mud pumps are located in the side tank and are used to drain the residual water in the residual water tank to the bank. A variable frequency drive module is connected to the mud pump and is used to drive the mud pump and adjust the motor speed of the mud pump. The flow velocity detection module is used to detect the flow velocity of residual water when it is discharged from the bank in real time and send the flow velocity signal.

2. The novel wastewater drainage system according to claim 1, characterized in that, Also includes: The control module is connected to the liquid level detection module, the frequency conversion drive module, and the flow rate detection module, respectively. The control module is used to receive liquid level signals and flow rate signals, and to control the frequency converter drive module to adjust the operating status of the mud pump according to the signals.

3. A novel wastewater drainage system according to claim 2, characterized in that, The control module is configured to: when the liquid level detection module detects that the liquid level has risen to a preset threshold, control the frequency converter drive module to start the single pump discharge mode and drive a mud pump to run.

4. A novel wastewater drainage system according to claim 3, characterized in that, The control module is also configured to: in single-pump bank discharge mode, receive the flow velocity signal sent by the flow velocity detection module, and when the flow velocity exceeds the preset upper limit of flow velocity, control the frequency conversion drive module to reduce the motor speed of the corresponding mud pump.

5. A novel wastewater drainage system according to claim 3, characterized in that, The control module is also configured to: in single-pump bank discharge mode, receive the flow velocity signal sent by the flow velocity detection module, and when the flow velocity is lower than the preset reasonable flow velocity lower limit, control the frequency conversion drive module to increase the motor speed of the corresponding mud pump to the rated speed.

6. A novel wastewater drainage system according to claim 3, characterized in that, The control module is also configured to: in single-pump discharge mode, when the flow rate of the mud pump is still lower than the preset reasonable flow rate limit when it is running at the rated speed, control the frequency conversion drive module to start the dual-pump series mode, drive the two mud pumps to run in series to increase the discharge pressure and discharge distance. The dual-pump series mode is realized through series pipelines and pressure balancing valves. The pressure balancing valves are used to prevent backflow between the mud pumps.

7. A novel wastewater drainage system according to claim 2, characterized in that, The two mud pumps are in a backup mode for each other. When one of the mud pumps fails, the control module controls the frequency converter drive module to switch to the operation of the other mud pump.

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