A graded flow monitoring well and flow measurement method

Abstract

This invention relates to a graded flow monitoring well and a flow measurement method, belonging to the field of pipeline flow measurement technology. It includes an inlet area connected to an inlet pipe and a drainage area connected to an outlet pipe. Two parallel partition walls, a first partition wall and a second partition wall, are respectively installed along the vertical surface on the downstream side of the inlet area and the upstream side of the drainage area. A graded flow measurement area is formed between the first and second partition walls, within which multiple flow measuring pipes of different inner diameters are arranged horizontally in parallel. Each flow measuring pipe is connected at both ends to the inlet area and the drainage area, respectively. Each flow measuring pipe is equipped with a valve and a flow meter. The inlet area includes a raised section, within which an ultrasonic level gauge, a flow velocity meter, and water quality monitoring instruments are installed. This invention has a reasonable design, compact structure, and convenient operation. It solves the problem in existing technologies where insufficient rainfall prevents the pipeline from fully filling, leading to inaccurate flow meter readings.

Description

Technical Field

[0001] This invention relates to a graded flow monitoring well and a flow measurement method, belonging to the field of pipeline flow measurement technology. Background Technology

[0002] Currently, electromagnetic flowmeters are a simple, accurate, and effective method for measuring pipeline flow. Effective flow measurement requires the pipeline to be in a full-flow state, making them generally suitable for pressure pipelines. Because the flow rate in gravity-fed pipelines is not constant, it's impossible to create a stable full-flow state for the flowmeter; therefore, the accuracy of using electromagnetic flowmeters to measure rainwater, sewage, and other gravity-fed pipelines is not high.

[0003] In cities, rainwater typically collects on the ground, is gathered by gravity pipes, and eventually flows into rivers. Detailed data on rainwater quality and quantity are difficult to obtain, leaving this data largely unavailable. As cities increasingly favor more refined management practices, many urban management departments require the installation of flow meters at rainwater inlets to monitor the flow rate and other data. However, rainfall often exhibits a parabolic variation over duration, and rainfall amounts fluctuate seasonally, posing significant challenges to measurement. Currently, effective, accurate, and flexible measurement devices and methods are still lacking. Summary of the Invention

[0004] The present invention aims to provide a graded flow meter well, which can effectively solve the problem of inaccurate flow measurement in gravity pipelines such as rainwater pipes.

[0005] To address the above problems, this invention provides a graded flow monitoring well, comprising an inlet area connected to an inlet pipe and a drainage area connected to an outlet pipe. Two parallel partition walls, a first partition wall and a second partition wall, are respectively installed along the vertical surface on the downstream side of the inlet area and the upstream side of the drainage area. A graded flow measurement zone is formed between the first and second partition walls, within which multiple flow measurement pipes of different inner diameters are arranged horizontally in parallel. Each flow measurement pipe has its two ends connected to the inlet area and the drainage area, respectively. Each flow measurement pipe is equipped with a valve and a flow meter. The inlet area includes a raised section, within which an ultrasonic level gauge, a flow velocity meter, and water quality monitoring instruments are installed.

[0006] Furthermore, the flow measuring tube is provided with several tubes, the diameter of which decreases sequentially, wherein the diameter of the inlet pipe is greater than or equal to the largest diameter among the several flow measuring tubes.

[0007] Furthermore, the bottom of the raised section is provided with a first raised part that is raised upwards, and its top surface is flush with the bottom surface of the water inlet pipe.

[0008] Furthermore, the width of the first raised section perpendicular to the water flow is the same as the diameter of the inlet pipe. The first raised section extends towards the graded flow measurement area and is provided with a second raised section. The bottom of the second raised section is provided with a second raised part, the top surface of which is flush with the bottom surface of the flow measurement pipe.

[0009] Furthermore, the raised area one and raised area two are separated by a third partition wall that is spaced apart along the width direction, with the top of the third partition wall extending to the top plate of the monitoring well.

[0010] Furthermore, a bypass area is provided between the graded flow measurement area and the top plate. One side of the bypass area is connected to the drainage area through a flow hole provided on the second partition wall, and a bypass gate is provided between the other side of the bypass area and the raised second area.

[0011] Furthermore, a flow measurement method for a graded flow monitoring well includes the following steps:

[0012] S1: Monitoring Well and Raw Data Preparation

[0013] Firstly, a graded flow monitoring well is used, which includes an inlet area connected to an inlet pipe and a drainage area connected to an outlet pipe. On the downstream side of the inlet area and the upstream side of the drainage area, two parallel partition walls, a first partition wall and a second partition wall, are respectively set along the facade. A graded flow measurement area is formed between the first partition wall and the second partition wall. Multiple flow measurement pipes with different inner diameters are arranged in parallel along the horizontal direction in the graded flow measurement area. The two ends of each flow measurement pipe are connected to the inlet area and the drainage area, respectively. Each flow measurement pipe is equipped with a valve and a flow meter. The inlet area includes a raised section, which is equipped with an ultrasonic level gauge, a flow velocity meter, and water quality monitoring instruments.

[0014] In the graded flow measurement zone, three flow measurement tubes with different inner diameters are arranged in parallel along the horizontal direction.

[0015] The diameter of the inlet pipe is d, and the diameters of the three flow measuring pipes 6, from largest to smallest, are D3, D2, and D1. The maximum flow rates of the three flow measuring tubes 6 are Q3, Q2 and Q1, respectively. The flow measurement range of the flow measuring tube 6 with a diameter of D3 is Q3 to Q2, the flow measurement range of the flow measuring tube 6 with a diameter of D2 is Q2 to Q1, and the flow measurement range of the flow measuring tube 6 with a diameter of D1 is Q1 to Q0. Q3 > Q2 > Q1 > Q0, and Q0 represents a flow rate of zero.

[0016] S2: Inflow Estimation

[0017] By using an ultrasonic level gauge and flow meter to read the liquid level h and flow velocity v of the raised section, and using Q = h * v * d, where h = liquid level of the cross-section, v = flow velocity, and d = width of the cross-section, the inflow rate Q can be roughly calculated.

[0018] S3: Valve control and water flow detection and recording;

[0019] If Q∈Q3~Q2, then open the valve of the flow measuring tube with diameter D3, and keep the valves of the other two flow measuring tubes closed. Use the flow meter to continuously monitor and record the flow rate.

[0020] If Q∈Q2~Q1, then open the valve of the flow measuring tube with diameter D2, and keep the valves of the other two flow measuring tubes closed. Use a flow meter to continuously monitor and record the flow rate.

[0021] If Q∈Q1~Q0, then open the valve of the flow measuring pipe with diameter D1, and keep the valves of the other two flow measuring pipes closed, and use the flow meter to continuously monitor and record the flow.

[0022] S4: Emergency Response Procedures

[0023] If the valve 61 and flow meter 62 in the flow measuring tube 6 malfunction, open the bypass gate 5 for inspection and replacement.

[0024] Compared with existing technologies, the present invention has the following advantages:

[0025] This invention features a reasonable design, compact structure, and convenient operation. It solves the problem in existing technologies where insufficient rainfall leads to inaccurate flow meter readings due to insufficient pipe flow. Based on the rainfall amount, the flow rate Q can be roughly calculated using an ultrasonic level gauge and flow velocity meter installed at the front end. This calculation serves as the basis for subsequent tiered measurement and monitoring. The flow meters on the corresponding Q-level measuring pipes are activated in stages, ensuring full flow within those pipes and guaranteeing measurement accuracy. Simultaneously, this invention incorporates a water quality analyzer for continuous monitoring of pollutants in rainwater. Combined with accurately measured flow data, the amount of each pollutant entering the river during each rainfall event can be precisely calculated, providing a basis for subsequent initial rainwater pollutant treatment and strong data support for the refined management of urban water environments. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2 for Figure 1 Sectional view of section II.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1-Inlet pipe, 2-Ultrasonic level gauge, 3-Flow meter, 4-Water quality monitoring instrument, 5-Bypass gate, 6-Flow measuring pipe, 7-First partition wall, 8-First raised section, 9-Inlet area, 10-Bypass area, 11-Drainage area, 12-Outlet pipe, 13-Second raised section, 14-Second partition wall, 15-Graded flow measuring area, 16-Top plate, 17-Third partition wall, 101-Flow hole, 131-Cover plate, 61-Valve, 62-Flow meter, 91-Raised section 1, 92-Raised section 2. Detailed Implementation

[0030] The present invention will now be further described with reference to the embodiments shown in the accompanying drawings:

[0031] like Figures 1 to 2 As shown, a graded flow monitoring well includes an inlet area 9 connected to an inlet pipe 1 and a drainage area 11 connected to an outlet pipe 12. Two parallel partition walls, a first partition wall 7 and a second partition wall 14, are respectively installed along the vertical surface on the downstream side of the inlet area 9 and the upstream side of the drainage area 11. A graded flow measurement area 15 is formed between the first partition wall 7 and the second partition wall 14. Multiple flow measurement pipes 6 with different inner diameters are arranged parallel to each other in the horizontal direction within the graded flow measurement area 15. Both ends of each flow measurement pipe 6 are connected to the inlet area 9 and the drainage area 11, respectively. Each flow measurement pipe 6 is equipped with a valve 61 and a flow meter 62. A cover plate 131 is installed on the top of the graded flow measurement area 15 for easy maintenance. The inlet area 9 includes a raised section 91, which contains an ultrasonic level gauge 2, a flow velocity meter 3, and a water quality monitoring instrument 4.

[0032] Furthermore, the flow measuring tube 6 is provided with several tubes, and the diameter of the several flow measuring tubes 6 decreases sequentially, wherein the diameter of the water inlet pipe 1 is greater than or equal to the largest diameter among the several flow measuring tubes 6.

[0033] Furthermore, the bottom of the raised section 91 is provided with a first raised part 8 that is raised upward, the top surface of which is flush with the bottom surface of the water inlet pipe 1, so that the measured liquid level of the ultrasonic level gauge 2 is consistent with the liquid level in the water inlet pipe 1, thereby improving the accuracy of the estimated flow rate Q.

[0034] Furthermore, the width of the first raised zone 91 perpendicular to the water flow is the same as the diameter of the inlet pipe 1. The first raised zone 91 extends towards the graded flow measurement zone 15 and is provided with a second raised zone 92. The bottom of the second raised zone 92 is provided with a second raised part 13, the top surface of which is flush with the bottom surface of the flow measurement pipe 6, thereby ensuring that the water flow smoothly enters the flow measurement pipe 6 without causing water congestion.

[0035] Furthermore, the raised area 91 and the raised area 92 are separated by a third partition wall 17 that is spaced apart along the width direction, and the top of the third partition wall 17 extends to the position of the top plate 16 of the monitoring well.

[0036] Furthermore, a bypass area 10 is provided between the graded flow measurement area 15 and the top plate 16. One side of the bypass area 10 is connected to the drainage area 11 through the flow hole 101 provided on the second partition wall 14, and a bypass gate 5 is provided between the other side of the bypass area 10 and the raised second area 92.

[0037] A method for measuring flow in a graded flow monitoring well includes the following steps:

[0038] S1: Monitoring Well and Raw Data Preparation

[0039] Firstly, a graded flow monitoring well is used, which includes an inlet area 9 connected to an inlet pipe 1 and a drainage area 11 connected to an outlet pipe 12. On the downstream side of the inlet area 9 and the upstream side of the drainage area 11, two parallel partition walls 7 and 14 are respectively set along the vertical surface. A graded flow measurement area 15 is formed between the first partition wall 7 and the second partition wall 14. Multiple flow measurement pipes 6 with different inner diameters are arranged in parallel along the horizontal direction in the 15. The two ends of each flow measurement pipe 6 are connected to the inlet area 9 and the drainage area 11, respectively. Each flow measurement pipe 6 is equipped with a valve 61 and a flow meter 62. The inlet area 9 includes a raised section 91. The raised section 91 is equipped with an ultrasonic level gauge 2, a flow velocity meter 3, and a water quality monitoring instrument 4.

[0040] In the graded flow measurement zone 15, three flow measurement tubes 6 with different inner diameters are set in parallel along the horizontal direction.

[0041] The diameter of the inlet pipe 1 is d, and the diameters of the three flow measuring pipes 6, from largest to smallest, are D3, D2, and D1. The maximum flow rates measured by the three flow measuring tubes are Q3, Q2 and Q1, respectively. The flow measurement range of the flow measuring tube with diameter D3 is Q3 to Q2, the flow measurement range of the flow measuring tube with diameter D2 is Q2 to Q1, and the flow measurement range of the flow measuring tube with diameter D1 is Q1 to Q0. Q3 > Q2 > Q1 > Q0, and Q0 represents a flow rate of zero.

[0042] S2: Inflow Estimation

[0043] Using ultrasonic level gauge 2 and flow meter 3, the liquid level h and flow velocity v of the raised zone 91 are read. Using Q = h * v * d, where h = liquid level of the water passage section, v = flow velocity, and d = width of the water passage section, the inlet flow rate Q can be roughly calculated.

[0044] S3: Valve control and water flow detection and recording

[0045] If Q∈Q3~Q2, then open valve 61 of the flow measuring pipe with diameter D3, and keep the valves of the other two flow measuring pipes closed. Use flow meter 62 to continuously monitor and record the flow rate.

[0046] If Q∈Q2~Q1, then open valve 61 of the flow measuring pipe with diameter D2, and keep the valves of the other two flow measuring pipes closed. Use flow meter 62 to continuously monitor and record the flow rate.

[0047] If Q∈Q1~Q0, then open valve 61 of the flow measuring pipe with diameter D1, and keep the valves of the other two flow measuring pipes closed. Use flow meter 62 to continuously monitor and record the flow rate.

[0048] S4: Emergency Response Procedures

[0049] If the valve 61 and flow meter 62 in the flow measuring tube 6 malfunction, open the bypass gate 5 for inspection and replacement.

[0050] The working process of this invention is as follows:

[0051] When the rainfall is low, if the estimated flow rate Q reaches the flow measurement range of the flow measuring tube 6 with a diameter of D1, the flow measuring tube can be fully filled. At this time, the PLC control circuit will open the valve 61 on the flow measuring tube 6 with a diameter of D1 and then start to continuously measure the flow rate.

[0052] When the rainfall increases and the estimated flow rate Q reaches the flow measurement range of the flow measuring tube with a diameter of D2, the flow measuring tube can be fully filled. At this time, the PLC control circuit closes the valve 61 of the flow measuring tube 6 with a diameter of D1 and opens the valve 61 of the flow measuring tube 6 with a diameter of D2, and then starts to continuously measure the flow rate.

[0053] When the rainfall is greater, and the upstream inlet pipe 1 is even full, the flow rate should reach the measurement range of the flow measuring pipe with a diameter of D3. At this time, the PLC control circuit will close the valve 61 of the flow measuring pipe 6 with a diameter of D2, and open the valve 61 of the flow measuring pipe 6 with a diameter of D3, and use the maximum flow meter to measure the rainfall.

[0054] As the rainfall gradually decreases towards the end of its duration, the above control process can be reversed via the PLC control circuit until the rainfall stops, at which point the flow rate of inlet pipe 1 becomes 0.

[0055] By programming a simple PLC control circuit, the flow rate through the inlet pipe during rainfall can be calculated and summarized. Combined with water quality data, important data such as rainwater flow rate change curves, pollutant concentration and total pollutant amount change curves over time can be analyzed, and the total amount of pollutants entering the river can be calculated.

[0056] The above description is merely one embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A flow measurement method for a graded flow monitoring well, comprising a graded flow monitoring well, characterized in that: The graded flow monitoring well includes an inlet area (9) connected to the inlet pipe (1) and a drainage area (11) connected to the outlet pipe (12). On the downstream side of the inlet area (9) and the upstream side of the drainage area (11), two parallel partition walls (7) and (14) are respectively set along the facade. A graded flow measurement area (15) is formed between the first partition wall (7) and the second partition wall (14). Several flow measurement pipes (6) with different inner diameters are arranged in parallel along the horizontal direction in the 15. The two ends of each flow measurement pipe (6) are connected to the inlet area (9) and the drainage area (11) respectively. Each flow measurement pipe (6) is equipped with a valve (61) and a flow meter (62). The inlet area (9) includes a raised section (91). The raised section (91) is equipped with an ultrasonic level gauge (2), a flow velocity meter (3) and a water quality monitoring instrument (4). The flow measurement method for the graded flow monitoring well includes the following steps: S1: Monitoring well and raw data preparation: Firstly, a graded flow monitoring well is used, which includes an inlet area (9) connected to the inlet pipe (1) and a drainage area (11) connected to the outlet pipe (12). On the downstream side of the inlet area (9) and the upstream side of the drainage area (11), two parallel partition walls (7) and (14) are respectively set along the facade. A graded flow measurement area (15) is formed between the first partition wall (7) and the second partition wall (14). Several flow measurement pipes (6) with different inner diameters are arranged in parallel along the horizontal direction in the 15. The two ends of each flow measurement pipe (6) are connected to the inlet area (9) and the drainage area (11) respectively. Each flow measurement pipe (6) is equipped with a valve (61) and a flow meter (62). The inlet area (9) includes a raised area (91). The raised area (91) is equipped with an ultrasonic level gauge (2), a flow velocity meter (3) and a water quality monitoring instrument (4). In the graded flow measurement zone (15), three flow measurement tubes (6) with different inner diameters are arranged in parallel along the horizontal direction. The diameter of the inlet pipe (1) is d, and the diameters of the three flow measuring pipes (6) from largest to smallest are D3, D2 and D1. The maximum flow rates of the three flow measuring tubes (6) are Q3, Q2 and Q1 respectively. The flow measuring range of the flow measuring tube (6) with a diameter of D3 is Q3~Q2, the flow measuring range of the flow measuring tube (6) with a diameter of D2 is Q2~Q1, and the flow measuring range of the flow measuring tube (6) with a diameter of D1 is Q1~Q0. Q3>Q2>Q1>Q0, and Q0 represents zero flow rate. S2: Estimated inflow rate: Using an ultrasonic level gauge (2) and a flow meter (3), the liquid level h and flow velocity v of the raised area (91) are read. Using Q = h * v * d, where h = liquid level of the water passage section, v = flow velocity, and d = width of the water passage section, the inlet flow rate Q can be roughly calculated. S3: Valve control and detection and recording of inlet water flow: If Q∈Q3~Q2, then open the valve (61) of the flow measuring pipe with diameter D3, and keep the valves of the other two flow measuring pipes closed. Use the flow meter (62) to continuously monitor and record the flow. If Q∈Q2~Q1, then open the valve (61) of the flow measuring pipe with diameter D2, and keep the valves of the other two flow measuring pipes closed. Use the flow meter (62) to continuously monitor and record the flow. If Q∈Q1~Q0, then open the valve (61) of the flow measuring pipe with diameter D1, and keep the valves of the other two flow measuring pipes closed. Use the flow meter (62) to continuously monitor and record the flow. S4: Emergency Response Procedures If the valve (61) and flow meter (62) of the flow measuring tube (6) malfunction, open the bypass gate (5) for inspection and replacement.

2. The flow measurement method for a graded flow monitoring well according to claim 1, characterized in that: The diameters of the plurality of flow measuring tubes (6) decrease sequentially, wherein the diameter of the inlet pipe (1) is greater than or equal to the largest diameter among the plurality of flow measuring tubes (6).

3. The flow measurement method for a graded flow monitoring well according to claim 1, characterized in that: The bottom of the raised section (91) is provided with a first raised part (8) that is raised upward, and its top surface is flush with the bottom surface of the water inlet pipe (1).

4. The flow measurement method for a graded flow monitoring well according to claim 1, characterized in that: The width of the first raised area (91) perpendicular to the water flow is the same as the diameter of the inlet pipe (1). The first raised area (91) extends towards the graded flow measurement area (15) and a second raised area (92) is provided. The bottom of the second raised area (92) is provided with a second raised part (13), the top surface of which is flush with the bottom surface of the flow measurement pipe (6).

5. The flow measurement method for a graded flow monitoring well according to claim 4, characterized in that: The raised zone 1 (91) and the raised zone 2 (92) are separated by a third partition wall (17) that is spaced apart along the width direction. The top of the third partition wall (17) extends to the top plate (16) of the monitoring well.

6. The flow measurement method for a graded flow monitoring well according to claim 1, characterized in that: A bypass area (10) is provided between the graded flow measurement area (15) and the top plate (16). One side of the bypass area (10) is connected to the drainage area (11) through the flow hole (101) provided on the second partition wall (14). A bypass gate (5) is provided between the other side of the bypass area (10) and the raised second area (92).

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