JP2008057187A - Rainwater discharge pump system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control rain water discharge pumps and operate an inflow gate at proper timings by determining the state of flow-down/storage in a sewer while suppressing the construction cost of an overall system by eliminating the need of expensive equipment and materials such as a rain radar and a complicated inflow predicting calculation. <P>SOLUTION: According to a level measurement signal S1 and an output from a trunk flowmeter 4 and a current meter measurement signal S2, an actually measured flow and a theoretical flow are calculated by each converter 5. According to the deviation between the actually measured flow and the theoretical flow, a process controller 12 determines whether a point where the trunk flowmeter is installed is in a flow-down state or a storage state for opening/closing an inflow gate 8 and limiting the quantity of the operation stands for the rain water discharge pumps 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rainwater drainage pump system that discharges to a river with a rainwater drainage pump, and in particular, controls the rainwater drainage pump and operates the inflow gate based on the deviation between the theoretical flow rate value and the actual flow rate value at the main flow meter installation point. It relates to a rainwater drainage pump system to be optimized.

  A rainwater drainage pump system is known in which rainwater is led to a rainwater drainage pump station via an inflow trunk line into which sewage or factory wastewater flows, and discharged into a river by a plurality of rainwater drainage pumps. In this rainwater drainage pump system, rainwater etc. is led to the rainwater pump well through the inflow gate provided downstream of the inflow trunk line, and the rainwater drainage pump is operated so that the rainwater pump well level is within a certain range. The number of units is controlled so that the water level of the fluid flowing through the inflow trunk line does not become too high due to rainwater or the like.

  At this time, place flow meters such as electromagnetic flow meters, ultrasonic flow meters, cough flow meters, etc. on the inflow trunk, etc., measure the flow rate of fluids such as sewage, factory wastewater, etc. In many cases, the operation of the sewage treatment plant is controlled by grasping the flow rate of the sewage flowing into the sewage treatment plant.

  In particular, the flow velocity / water level calculation type flow meter, which is one of the ultrasonic flow meters, can be used relatively easily even in locations with large pipe diameters, and has few features such as less obstruction to the flow. Yes.

  By the way, in such a rainwater drainage pump system, as a method for controlling the rainwater drainage pump, a control for operating or stopping the rainwater drainage pump according to the water level of the rainwater drainage pump well (rainwater pump well level) is adopted. There are many cases.

  In addition, as a method of operating the inflow gate, if the rainwater pump well water level does not decrease even if all the rainwater drainage pumps are operated, it is unavoidable to manually adjust the opening of the inflow gate in order to suppress the inflow to the rainwater pump well. I often squeeze with.

  There is also a method for predicting the amount of rainwater inflow after a certain time by performing calculations using prediction formulas, etc., using information obtained from ground rain gauges, rainfall radars, in-pipe water level meters, flow meters, etc. Are known. In addition, the prediction result may be used to control the rainwater drainage pump or the inflow gate.

  Furthermore, in such a rainwater drainage pump system, the following patent documents are known as a technique for installing a trunk flow meter on the inflow trunk line and utilizing the flow or storage state thereof.

The “inflow prediction device” described in Patent Document 1 describes a technique for determining the flow and storage state in the pipe at the main flow meter installation point, and switching the prediction formula of the inflow according to the determination. ing. In addition, in the “mainstream inflow situation measuring apparatus and method” described in Patent Document 2, a transmitter that transmits radio waves or ultrasonic waves is allowed to flow down in the inflow trunk, and the flow down time of the transmitter is measured for each section. In addition, a technique for determining a storage state and a technique for performing rainwater drainage pump operation and inflow gate operation using the determination result are described.
JP 2003-138632 A JP 2006-47035 A

  However, in such a conventional rainwater drainage pump system, the control of the rainwater drainage pump and the operation of the inflow gate are automatically performed using the flow or storage state determined from the measurement information of the main flow meter. Therefore, there is a strong demand for the development of a system that can automatically control the rainwater drainage pump and operate the inflow gate using the flow or storage state determined from the measurement information of the main flow meter. It was.

  In view of the above circumstances, the present invention eliminates the need for expensive equipment such as rainfall radar, complicated inflow prediction calculation, and lowers the construction cost of the entire system, while determining the flow and storage state in the pipe The purpose is to provide a rainwater drainage pump system that can perform rainwater drainage pump control and inflow gate operation at an appropriate timing.

  In order to achieve the above object, according to the present invention, in claim 1, a stormwater drainage pump system provided in a stormwater drainage pump station and a stormwater drainage pump system for controlling the operation content of the inflow gate is a trunk line installed on the inflow trunk line. Actual flow value calculation unit for calculating actual flow value based on measured water level and measured flow obtained by flow meter, and theoretical flow value calculation unit for calculating theoretical flow value based on measured water level obtained by main flow meter Compare the actual flow value obtained by these actual flow value calculation units with the theoretical flow value obtained by the theoretical flow value calculation unit to determine the flow and storage state in the pipe at the main flow meter installation point. And a control unit that controls the operation of the rainwater drainage pump and the inflow gate according to the determination result.

  Further, the control unit is characterized by increasing the number of operating rainwater drainage pumps when the storage state at the main flow meter installation point continues for a certain period of time.

  Further, the control unit is characterized in that the inflow gate is closed when the storage state at the main flow meter installation point continues for a certain period of time and the storage state is not eliminated even if all the rainwater drainage pumps are activated. .

  The controller is characterized in that the inflow gate is opened when the storage state at the main flow meter installation point changes to the flow-down state and the flow rate decreases.

  In addition, the control unit reduces the number of operating rainwater drainage pumps when the storage state at the main flow meter installation point is changed to the flow-down state and the flow rate is reduced even when the inflow gate is fully opened. It is characterized by that.

  According to the present invention, expensive equipment such as a rain radar, complicated inflow prediction calculation is unnecessary, the construction cost of the entire system can be kept low, and the flow / storage state in the pipe can be determined, and the appropriate timing The storm water drain pump control and inflow gate operation can be performed.

  FIG. 1 is a schematic configuration diagram showing an embodiment of a rainwater drainage pump system according to the present invention.

  A rainwater drainage pump system 1 shown in this figure includes a plurality of main flow meters 4 arranged on each inflow main line 3 into which fluid 2 such as sewage and factory waste water flows, and water level measurement signals output from the main flow meters 4. S1, The flow velocity measurement signal S2 is taken in, the actual flow value and the theoretical flow value are obtained, the plurality of converters 5 that output the measurement signal S3, the rain amount at each location in the area are measured, and the rain amount measurement signal S4 is output. Inflow gate state signal S6 that is provided in a plurality of rain gauges 6 and an inflow trough 7 of the rainwater drainage pumping station and indicates an opening state and the like while adjusting the opening according to the input inflow gate operation command S5. , A rainwater pump well 9 that stores the fluid 2 that has passed through the inflow gate 8, and a rainwater pump well 9 that is provided in the rainwater pump well 9 and is input to the rainwater drain pump control command S 7. Fluid in And a plurality of rainwater drainage pumps 10 that output a rainwater drainage pump status signal S8 indicating the drainage state while draining into a river or the like, and each rainwater drainage pump 10 is provided with a valve according to a discharge valve control command S9. A plurality of discharge valves 11 that output a discharge valve state signal S10 indicating a discharge valve state while adjusting the opening and adjusting the discharge amount of the rainwater drainage pump 10 are provided.

  Further, the rainwater drainage pump system 1 includes a measurement signal S3 output from each converter 5, a rainfall measurement signal S4 output from each rain gauge 6, an inflow gate state signal S6 output from the inflow gate 8, and each rainwater drainage. The storm water drain pump state signal S8 output from the pump 10 and the discharge valve state signal S10 output from each discharge valve 11 are taken in, and the deviation between the actual flow rate and the theoretical flow rate is calculated, and the main flow meter installation point is in the flow-down state. Or a storage state, and generates an inflow gate operation command S5, a plurality of rainwater drainage pump control commands S7, and a plurality of discharge valve control commands S9 according to the determination result, and the inflow gate 8, each rainwater drainage pump 10. Process controller 12 for supplying each discharge valve 11 and maintaining the water level of the fluid 2 flowing in the inflow trunk line 3 below an allowable constant water level, and a rainwater drainage pump station Is installed in the monitoring and control room of the rainwater drainage pump station, and is output from the process controller 12 via the LAN 14. And a monitoring device 15 for displaying the operating status of the rainwater drainage pump station in a drawing.

  And the measurement signal S3 output from each converter 5, the rainfall measurement signal S4 output from each rain gauge 6, the inflow gate state signal S6 output from the inflow gate 8, and the rainwater output from each rainwater drainage pump 10 Based on the drainage pump state signal S8, the discharge valve state signal S10 output from each discharge valve 11, the process controller 12 calculates the deviation between the actual flow rate and the theoretical flow rate, and the main flow meter installation point is in the downflow state or stored. Determine if it is in a state. Further, an inflow gate operation command S5, a plurality of rainwater drainage pump control commands S7, and a plurality of discharge valve control commands S9 corresponding to the determination result are generated to control the inflow gate 8, each rainwater drainage pump 10, and each discharge valve 11. Then, the water level of the fluid 2 flowing in the inflow trunk line 3 is kept below the allowable water level.

  Next, the operation of the rainwater drainage pump system 1 will be described with reference to the schematic configuration diagram shown in FIG. 1, the flowcharts shown in FIGS. 2 and 3, and the schematic diagrams shown in FIGS. 4 and 5.

  First, when the main flow meter 4 installed in the inflow main line 3 is a flow velocity / water level calculation type flow meter, the water level and flow rate of the fluid 2 flowing through the inflow main line 3 are measured by the main flow meter 4, and the inflow A water level measurement signal S1 and a flow rate measurement signal S2 indicating the water level and flow rate of the fluid flowing through the main line 3 are output.

  Then, as shown in the flowchart of FIG. 2, the water level measurement signal S1 and the flow velocity measurement signal S2 are taken in by the converter 5 (step ST1), and the actual flow rate value and the theoretical flow rate value are calculated (steps ST2 and ST3). A measurement signal S3 including these actually measured flow value and theoretical flow value is generated and supplied to the process controller 12 (step ST4), and an inflow gate state signal S6 output from the inflow gate 8 and output from each rainwater drainage pump 10 The storm water drain pump status signal S8 and the discharge valve status signal S10 output from each discharge valve 11 are supplied to the process controller 12.

  At this time, as shown in FIG. 4, the converter 5 determines the cross-sectional area of the fluid 2 from the water level measured by the water level sensor in the main flow meter 4, and also measures it by the flow rate sensor in the main flow meter 4. The average flow velocity is obtained from the flow velocity (point flow velocity), and the actual flow rate value is calculated from the product of the cross-sectional area and the average flow velocity.

  Here, the relationship between the point flow velocity “Vp” and the average flow velocity “Va” is expressed by the following equation.

Va = Kp · Vp (1)
However, Kp: correction coefficient And when the flow velocity distribution in the pipe rod is expressed by a logarithmic law and the pipeline is assumed to be a rough surface, the correction coefficient for converting the point flow velocity into the average flow velocity is obtained by the following equation or the like. .

However, n: Roughness coefficient of pipe surface R: Diameter depth that varies depending on channel shape and water level y: Point flow velocity measurement water depth g: Gravity acceleration In addition, correction coefficient using these formulas (2) and (3) May be corrected in consideration of the maximum flow velocity position.

  Therefore, the correction coefficient curve “Kp” is determined by giving the roughness coefficient “n”, the point velocity measurement water depth “y”, the channel shape, and the water level. Then, the average flow velocity “Va” is obtained by the equation (1). The actual flow rate value (actual flow rate value) is obtained by multiplying the average flow velocity “Va” by the cross-sectional area.

In parallel with this operation, the Manning equation shown below is used, and the average flow velocity is calculated from the water level measured by the water level sensor in the main flow meter 4.

However, n: Roughness coefficient R: Diameter depth that varies depending on the water channel shape and water level I: Pipe slope The average flow velocity by giving the roughness coefficient “n”, pipe slope “1”, water channel shape, and water level “Va” is obtained. By multiplying the average flow velocity “Va” by the cross-sectional area, a theoretical value of flow rate (theoretical flow rate value) is obtained, and a measurement signal S3 indicating these actually measured flow rate value and theoretical flow rate value is generated.

  In parallel with this operation, each measurement signal S3 output from each converter 5 is captured by the process controller 12 as shown in the flowchart of FIG. 3 (step ST10), and each time indicated by these measurement signals S3. The actual flow rate value and the theoretical flow rate value are compared with each other, and if the deviation between the actual flow rate value and the theoretical flow rate value is within a certain range (steps ST11 and ST12) as shown in the graph of FIG. In step ST13, it is determined that the ideal flow (equal flow) continues (flowing state) in step (step ST13), and a certain time has elapsed since the flow in the pipe rod changed from the storage state to the flowing state. Is checked.

  When a certain time has elapsed since the flow in the pipe changes from the storage state to the flow-down state (step ST14), the process controller 12 checks whether or not the inflow gate 8 is fully opened. If the inflow gate 8 is not fully opened (step ST15), an inflow gate command for instructing the inflow gate 8 to be opened is generated, the inflow gate 8 is opened, and the rainwater acquisition restriction is released. It starts (step ST16).

  Further, when it is checked whether or not the inflow gate 8 is in a fully open state, if the inflow gate 8 is in a fully open state (step ST15), the process controller 12 causes the water level (or flow rate) in the pipe to be filled. Is checked, and when the water level in the pipe is decreasing (step ST17), a rainwater drainage pump control command for instructing one of the operating rainwater drainage pumps 10 to stop. S7 is generated, and one of the rainwater drainage pumps 10 is stopped (step ST18).

  In addition, when it is checked whether the deviation between the measured flow rate value and the theoretical flow rate value is within a certain range, the deviation between the measured flow value and the theoretical flow value is out of a certain range, for example, the measured value Is less than 90% of the theoretical value (step ST12), the process controller 12 determines that the flow in the tube is in the storage state (step ST19), and the flow in the tube is stored from the flow-down state. It is checked whether a certain amount of time has passed since the state changed.

  And when the fixed time has passed since the flow in the pipe rod changed from the flow-down state to the storage state (step ST20), whether or not all the rainwater drainage pumps 10 are activated by the process controller 12 If there is a rainwater drainage pump 10 that has not been activated (step ST21), a rainwater drainage pump control command S7 that instructs activation is generated for one of the rainwater drainage pumps 10 that has not been activated, One of the rainwater drainage pumps 10 is activated (step ST22).

  Further, when it is checked whether all the rainwater drainage pumps 10 are activated, if all the rainwater drainage pumps 10 are activated (step ST21), the process controller 12 can It is checked whether the water level (or flow rate) is increasing, and when the water level in the pipe is increasing (step ST23), an inflow gate command for instructing the closing operation is generated for the inflow gate 8. The inflow gate 8 is closed (step ST24).

  As a result, the flow rate of the fluid 2 flowing from the inflow trough 7 into the rainwater pump well 9 is limited, and the fluid 2 having a flow rate exceeding the processing capacity of the rainwater drainage pump station is prevented from flowing into the rainwater pump well 9. The drainage pumping station is protected.

  Thus, in this embodiment, each converter 5 calculates the actual flow rate and the theoretical flow rate based on the water level measurement signal S1 and the flow velocity measurement signal S2 output from the main flow meter 4, and the actual flow rate and the theoretical flow rate. Based on the deviation, the process controller 12 determines whether the main flow meter installation point is in the flow-down state or the storage state, and performs opening / closing control of the inflow gate 8, control of the number of operating storm water drain pumps 10, and the like. . This eliminates the need for expensive equipment such as rainfall radar and complicated inflow flow prediction calculations, and allows the flow and storage status of pipes to be judged while keeping the construction cost of the entire system low. Drain pump control and inflow gate operation can be performed.

  Further, in this embodiment, when the storage state at the main flow meter installation point continues for a certain period of time, the number of operating rainwater drainage pumps 10 is added by the process controller 12. For this reason, when the flow rate of rainwater or the like flowing into the pipe is increasing, the number of operating rainwater drainage pumps 10 is increased to increase the discharge flow to the river so that rainwater or the like does not stay in the pipe. Can be.

  Further, in this embodiment, when the storage state at the main flow meter installation point continues for a certain period of time and the storage state is not resolved even if all the rainwater drainage pumps 10 are activated, the inflow gate 8 is closed. Yes. For this reason, even if rainwater more than expected flows into the pipe, the rainwater drainage pump station can be protected by closing the inflow gate 8.

  In this embodiment, the inflow gate 8 is opened when the storage state at the main flow meter installation point is changed to the flow-down state and the flow rate is decreasing. For this reason, when the flow rate of rainwater flowing into the pipe returns to the normal value from the expected value, the rainwater uptake amount limit of the rainwater drainage pump station can be canceled and normal processing can be resumed. it can.

  Further, in this embodiment, when the storage state at the main flow meter installation point is changed to the flow-down state and the inflow gate 8 is fully opened, the number of operating rainwater drainage pumps 10 is reduced when the flow rate is decreasing. Like to do. For this reason, when the flow rate of rainwater or the like flowing into the pipe is decreasing, the number of operating rainwater drainage pumps 10 can be reduced and the operating cost can be reduced.

  In the above-described embodiment, the main flow meter 4 is arranged at an arbitrary position of each inflow main line 3 into which the fluid 2 such as sewage and factory waste water flows, but each main flow meter 4 can be installed. Of each location, it is determined that the rainwater drainage pump 10 is stopped even if all rainwater drainage pumps 10 are stopped when there is no rainwater near the rainwater drainage pump station. It is desirable.

  Moreover, in embodiment mentioned above, it is determined whether the flow in a pipe rod is a flowing-down state or a storage state based on the deviation between the measured flow rate value and the theoretical flow rate value, and each rainwater drainage pump 10 is based on the determination result. The number of operating and the opening of the inflow gate 8 are controlled. Based on the determination result, either the number of operating drainage pumps 10 or the opening of the inflow gate 8 is controlled. Alternatively, the number of operating storm water drain pumps 10 may be controlled, and the opening degree of the inflow gate 8 may be controlled after all the storm drain pumps 10 have been stopped or started.

  Further, in the above-described embodiment, the rainwater drainage pump system 1 according to the present invention is described by taking a pipe rod as an example. However, the rainwater drainage pump system 1 according to the present invention may be applied to the opening. good.

It is a schematic structure figure showing one embodiment of a rainwater drainage pump system by the present invention. It is a flowchart which shows the operation example of the converter shown in FIG. It is a flowchart which shows the operation example of the process controller shown in FIG. It is a schematic diagram which shows the example of a determination operation | movement of the flowing-down state and storage state of the rainwater drainage pump system shown in FIG. The schematic diagram which shows the example of criteria of determination of the flowing-down state and the storage state of the rainwater drainage pump system shown in FIG.

Explanation of symbols

1: Rainwater drainage pump system 2: Fluid 3: Inflow main line 4: Main line flow meter 5: Converter (actual flow value calculation unit, theoretical flow value calculation unit)
6: Rain gauge 7: Inflow tank 8: Inflow gate 9: Rainwater pump well 10: Rainwater drainage pump 11: Discharge valve 12: Process controller (control unit)
13: Node 14: LAN
15: Monitoring device

Claims (5)

In the rainwater drainage pump system installed in the rainwater drainage pumping station and the rainwater drainage pump system that controls the operation of the inflow gate
An actual flow value calculation unit for calculating an actual flow value based on the measured water level and the measured flow obtained by the main flow meter installed in the inflow main line,
Based on the measured water level obtained by the main flow meter, a theoretical flow value calculation unit for calculating a theoretical flow value,
Compare the actual flow value obtained in the actual flow value calculation unit and the theoretical flow value obtained in the theoretical flow value calculation unit, determine the flow in the pipe at the main flow meter installation point, the storage state, According to the determination result, the control unit that operates the rainwater drainage pump, controls the inflow gate,
A rainwater drainage pump system characterized by comprising: In the rainwater drainage pump system according to claim 1,
The control unit increases the number of operating rainwater drainage pumps when the storage state at the main flow meter installation point continues for a certain period of time,
Rainwater drainage pump system characterized by that. In the rainwater drainage pump system according to claim 1,
The control unit, when the storage state at the main flow meter installation point continues for a certain period of time, even if all rainwater drainage pumps are activated, when the storage state is not eliminated, the inflow gate is closed,
Rainwater drainage pump system characterized by that. In the rainwater drainage pump system according to claim 1,
The controller is configured to open the inflow gate when the storage state at the main flow meter installation point is changed to the flow-down state and the flow rate is reduced.
Rainwater drainage pump system characterized by that. In the rainwater drainage pump system according to claim 1,
The control unit reduces the number of operating rainwater drainage pumps when the storage state at the main flow meter installation point changes to the flowing-down state and the inflow gate is fully opened, but the flow rate is decreasing,
Rainwater drainage pump system characterized by that.

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