Flow metering type intercepting well and control method thereof

Abstract

The application provides a flow metering type intercepting well and a control method thereof, and belongs to the technical field of drainage, wherein the flow metering type intercepting well comprises a well body, a monitoring system and a control system, the well body comprises two well chambers, the two well chambers are connected with a water inlet pipe through a first control valve, connected with a rainwater pipe through a second control valve and connected with a sewage pipe through a third control valve, the monitoring system comprises two liquid level detection pieces arranged in the two well chambers respectively and used for detecting the liquid level of the well chamber, the control system is electrically connected with the first control valve, the second control valve, the third control valve and the monitoring system, and when any one of the two well chambers is used for water storage, the control system calculates flow data of inlet liquid according to the liquid level data in the well chamber. The flow metering type intercepting well provided by the application realizes accurate measurement of the core index flow in the drainage system and realizes intelligent intercepting regulation and control of the drainage system through the arrangement of the two well chambers, one well chamber is used for flow monitoring and the other well chamber is used for flow release.

Description

Technical Field

[0001] This invention relates to the field of drainage technology, specifically to a flow metering interception well and its control method. Background Technology

[0002] Interception wells are used in rainwater systems or combined sewer systems. Taking the rainwater interception well in the most common rainwater and sewage separation system as an example, its purpose is to intercept sewage during the dry season and the initial rainwater with high pollutant concentration at the beginning of rainfall into the sewage pipe and send it to the sewage treatment plant. At the same time, the middle and later rainwater with lower pollutant concentration is directly discharged into the surface water, reducing the operating pressure of the sewage treatment plant.

[0003] Currently, intelligent interception systems commonly used in municipal drainage typically require flow control, and flow rate is also a core monitoring indicator for urban drainage systems, which is of great significance to the drainage system of the entire region.

[0004] However, the operation of electromagnetic flowmeters is affected by factors such as the fact that the water flow in drainage pipes is usually not full, the presence of solid substances in the liquid, and the sloshing and different flow patterns of the liquid in the pipe, making it difficult to measure flow data accurately. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the flow rate of water flowing into the interception well cannot be accurately monitored in the prior art, thereby providing a flow metering interception well and its control method.

[0006] To solve the above-mentioned technical problems, the present invention provides a flow metering interception well, comprising:

[0007] The well body includes two well chambers, which are respectively connected to a water inlet pipe via a first control valve, a rainwater pipe via a second control valve, and a sewage pipe via a third control valve;

[0008] The monitoring system includes two liquid level detection devices, which are respectively installed in the two well chambers, for monitoring the liquid level in the well chambers;

[0009] The control system is electrically connected to the first control valve, the second control valve, the third control valve, and the monitoring system. When either of the two well chambers is storing water, the control system calculates the inlet flow rate based on the liquid level data in that well chamber.

[0010] Optionally, the two well chambers are arranged adjacent to each other, the first control valve is a three-way control valve with two outlets, the inlet of the first control valve is connected to the water inlet pipe, one outlet of the first control valve is connected to one of the well chambers, and the other outlet is connected to the other well chamber.

[0011] Optionally, the first control valve is an electromagnetic switching valve.

[0012] Optionally, a second control valve is provided on the rainwater outlet of each well chamber to control the flow rate of the rainwater outlet.

[0013] Optionally, the second control valve is an electrically operated upward-opening gate valve.

[0014] Optionally, a third control valve is provided on the sewage outlet of each well chamber to control the flow rate of the sewage outlet.

[0015] Optionally, the third control valve is an electrically operated upward-opening gate.

[0016] Optionally, the monitoring system further includes a rainfall detection device, which is electrically connected to the control system.

[0017] The present invention also provides a control method for a flow metering interception well, which adopts the flow metering interception well described in any of the above claims, including a first mode in which the two well chambers sequentially cycle water storage and discharge.

[0018] When the first well chamber is filled with water, the inlet of the second well chamber is closed, and water is only introduced into the first well chamber. The outlet of the first well chamber is also closed. The liquid level in the first well chamber is monitored in real time by the liquid level detection device located in the first well chamber of the monitoring system, and the liquid level data is transmitted to the control system. The control system calculates the inlet flow rate data based on the liquid level data.

[0019] While the first well chamber is storing water, the second well chamber is discharging water through the rainwater pipe and / or the sewage pipe;

[0020] When the liquid level in the first well chamber reaches a first threshold, the system switches to storing water through the second well chamber and releasing water from the first well chamber.

[0021] During the water storage process in the second well chamber, the liquid level detection device of the monitoring system located in the second well chamber monitors the liquid level in the second well chamber in real time and transmits the liquid level data to the control system. The control system calculates the inlet flow rate data based on the liquid level data.

[0022] When the liquid level in the second well chamber reaches the first threshold, the system switches back to storing water through the first well chamber and releasing water through the second well chamber, and this process repeats continuously.

[0023] Optionally, when the well chamber is being drained, the control system adjusts the interception ratio of the well chamber being drained based on the calculated influent flow rate data.

[0024] Optionally, when the well chamber is releasing water, the control program of the control system is as follows:

[0025] When the rainfall is zero, the third control valve connected to the sewage pipe is fully open, and the second control valve connected to the rainwater pipe is closed.

[0026] When the rainfall is greater than zero and the inlet flow rate increases to Q1, the control system controls the second control valve to open wider and the third control valve to close narrower, thereby adjusting the flow cutoff ratio.

[0027] Optionally, when the fluid flow rate in the well chamber increases to Q2, Q2 is greater than Q1, the control system controls the second control valve to fully open and the third control valve to fully close.

[0028] Optionally, when the inlet flow rate in the well chamber increases to the alarm value Q3, Q3 is greater than Q2, the first mode changes to the second mode. In the second mode, the inlets of the two well chambers are opened simultaneously, and the two well chambers discharge water simultaneously.

[0029] Optionally, when the flow has been released for a period of time or the rainfall decreases, the control system switches from the second mode to the first mode to monitor the flow in the well chamber and determine whether the flow is higher than the alarm value Q3. If it is higher, the system switches from the first mode to the second mode to release the flow in both well chambers at the same time; if it is lower, the system continues to use the first mode.

[0030] Optionally, rainfall is detected by a rainfall sensor, and the control system controls the size of the second and third control valves in the discharge chamber based on the detected rainfall.

[0031] The technical solution of this invention has the following advantages:

[0032] 1. The flow metering interception well provided by the present invention includes a well body, a monitoring system, and a control system. The well body includes two well chambers, which are respectively connected to an inlet pipe via a first control valve, a rainwater pipe via a second control valve, and a sewage pipe via a third control valve. The monitoring system includes two liquid level detection devices, which are respectively used to detect the liquid level in the well chambers. The control system is electrically connected to the first control valve, the second control valve, the third control valve, and the monitoring system. When either of the two well chambers is storing water, the control system calculates the inlet flow rate data based on the liquid level data in that well chamber.

[0033] By using two manholes, accurate flow monitoring is achieved using liquid level data, eliminating the inaccuracies of flow monitoring under non-full pipe conditions. Furthermore, the data is unaffected by suspended solids in the water. While one manhole monitors flow, the other discharges, ensuring accurate measurement of the core drainage system indicator, flow rate, without impacting the discharge of rainwater and sewage. Control valves are adjusted based on the water volume changes per unit time from initial water storage to selective discharge, reducing interference from instantaneous flow or water quality variations and improving flow measurement accuracy. The subsequent discharge after water storage provides a strong impact, effectively flushing rainwater and sewage pipes.

[0034] 2. The flow metering interception well provided by the present invention has two well chambers arranged adjacent to each other. The first control valve is a three-way control valve with two outlets. The inlet of the first control valve is connected to the water inlet pipe, one outlet of the first control valve is connected to one well chamber, and the other outlet is connected to the other well chamber. This realizes the simultaneous control of the water inlet of the two well chambers by the first control valve. The structure is simple and the control is convenient. The first control valve is an electromagnetic switching valve, which has fast response speed, high accuracy, and simple structure.

[0035] 3. The flow metering interception well provided by the present invention has a second control valve installed on the rainwater outlet of each well chamber. The flow rate of the rainwater outlet is controlled by the second control valve. The second control valve controls the flow rate of the corresponding rainwater outlet independently and does not affect each other.

[0036] Each manhole is equipped with a third control valve at its sewage outlet. The flow rate of the sewage outlet is controlled by the third control valve. The third control valve controls the flow rate of the corresponding sewage outlet independently and does not affect each other. The interception and adjustment of rainwater and sewage in the manhole is realized according to the inlet flow rate.

[0037] 5. The flow metering interception well provided by the present invention has electric top-opening gate valves for the second and third control valves. When the flow rate is small, water can pass through without fully opening, thus reducing time and energy consumption.

[0038] 6. The flow metering interception well provided by the present invention also includes a rainfall detection device in the monitoring system. The rainfall detection device is electrically connected to the control system. According to the monitoring data of the rainfall detection device, the control system controls the inlet and outlet of the interception well to cooperate accordingly.

[0039] 7. The control method for the flow metering intercepting well provided by the present invention adopts a flow metering intercepting well, including a first mode. In the first mode, two well chambers are used for water storage and discharge in sequence. When the first well chamber is storing water, the liquid level detection device monitors the liquid level in the first well chamber in real time and transmits the liquid level data to the control system. The control system calculates the inlet flow rate data based on the liquid level data. At this time, the second well chamber discharges water through a rainwater pipe and / or a sewage pipe. When the liquid level in the first well chamber reaches a first threshold, the system switches to storing water through the second well chamber and discharging water through the first well chamber. At this time, the flow rate data is detected in the second well chamber. The cycle repeats. The setting of the first threshold makes the alternation node of water storage and discharge the height of the liquid level, which can adapt to different flow rates of inlet water.

[0040] While one well chamber monitors the flow rate, another well chamber discharges the flow. This not only ensures accurate measurement of the core indicator of the drainage system—flow rate—but also does not affect the discharge of rainwater and sewage. By controlling the valve based on the change in water volume per unit time from the start of water storage to selective discharge, the interference of instantaneous flow rate or water quality changes on the control system can be reduced to a certain extent, making the flow rate measurement more accurate.

[0041] 8. The control method for flow metering interception wells provided by the present invention, when the well chamber is discharging, the control system adjusts the interception ratio of the well chamber discharging according to the calculated influent flow data, and adjusts the opening and closing size of the second control valve and the third control valve according to the flow data, so as to realize different flow control and distribution of sewage pipe and rainwater pipe, so as to ensure the interception of pollutants as much as possible while reducing the operating burden of sewage treatment plant.

[0042] 9. The control method for the flow metering interception well provided by the present invention, when the well chamber is discharging, the control program of the control system is as follows: when the rainfall is zero, the third control valve connected to the sewage pipe is fully open, and the second control valve connected to the rainwater pipe is closed, and all incoming water is discharged through the sewage pipe without water storage or flow monitoring; when the rainfall is greater than zero and the inlet flow rate increases to Q1, the control system controls the second control valve to open wider and controls the third control valve to close narrower, adopting partial interception, controlling the flow distribution of the sewage pipe and the rainwater pipe, and realizing the adjustment of the interception ratio.

[0043] 10. The control method for flow metering interception well provided by the present invention, when the influent flow rate in the well chamber increases to Q2, Q2 is greater than Q1, the control system controls the second control valve to be fully opened and the third control valve to be fully closed. At this time, the rainfall is large, there is a risk of flooding, and due to the dilution of rainwater, the concentration of pollutants in the incoming water is usually low. Therefore, priority should be given to ensuring the discharge of rainwater to avoid clean rainwater entering the sewage pipe and affecting the operation of the sewage treatment plant.

[0044] When the inflow rate in the well chamber increases to the alarm value Q3, Q3 is greater than Q2, the first mode changes to the second mode. In the second mode, the inlets of the two well chambers are opened at the same time, and the two well chambers discharge water at the same time. The second control valve of both well chambers is kept fully open, and the third control valve is fully closed to ensure flood control safety.

[0045] When the flow rate has been released for a period of time or the rainfall decreases, the control system switches from the second mode to the first mode to monitor the flow rate in the well chamber and determine whether the flow rate is higher than the alarm value Q3. If it is higher, the system switches from the first mode to the second mode to release the flow rate in both well chambers at the same time. If it is lower, the system continues to use the first mode. By controlling the system and switching between the first and second modes, the safety of the interception well is ensured and it is kept in an appropriate flow release state. Attached Figure Description

[0046] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of a specific embodiment of a flow metering intercepting well provided in the embodiments of the present invention;

[0048] Figure 2 for Figure 1 A schematic diagram of the side view structure;

[0049] Figure 3 for Figure 2 A top-view structural diagram.

[0050] Explanation of reference numerals in the attached figures:

[0051] 1. Well body; 2. Well chamber; 3. First control valve; 4. Inlet pipe; 5. Second control valve; 6. Rainwater pipe; 7. Third control valve; 8. Sewage pipe; 9. Liquid level detection device; 10. Rainfall detection device. Detailed Implementation

[0052] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," 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 the invention and for 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0054] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0056] Currently, intelligent interception systems commonly used in municipal drainage typically require flow rate control, which is also a core monitoring indicator for urban drainage systems, holding significant importance for the entire region's drainage system. However, factors such as the non-full-pipe flow, the presence of solid substances in the liquid, and the sloshing and different flow patterns within the pipe can all affect the operation of electromagnetic flowmeters, making it difficult to accurately measure flow rate data.

[0057] Drainage pipes typically accumulate silt, food scraps, and other solid materials, leading to sediment buildup over time. This reduces the pipes' flow capacity, hinders drainage, and can cause urban flooding. Long-term sediment buildup can also cause organic matter in the sediment to produce toxic gases and acidic substances under the action of microorganisms, resulting in pipe leaks and pollution. Currently, intelligent interception devices lack the function of clearing or mitigating sediment buildup; they can only clear sediment after it has occurred using robots or other methods.

[0058] The flow metering interception well provided in this embodiment can be used in a drainage interception system to accurately monitor the incoming water flow and simultaneously realize functions such as flow monitoring, interception control, and pipeline flushing.

[0059] like Figures 1 to 3The diagram illustrates a specific implementation of a flow metering interception well provided in this embodiment. It includes a well body 1, a monitoring system, and a control system. The well body 1 comprises two chambers 2, which are respectively connected to an inlet pipe 4 via a first control valve 3, a rainwater pipe 6 via a second control valve 5, and a sewage pipe 8 via a third control valve 7. The monitoring system includes two level detection elements 9, respectively installed in the two chambers 2, for monitoring the level of the liquid in each chamber. The control system is electrically connected to the first control valve 3, the second control valve 5, the third control valve 7, and the monitoring system. When either chamber 2 is filled with water, the control system calculates the inlet flow rate based on the level data in that chamber 2, and can calculate the inlet flow rate based on the rate of change of its level data.

[0060] By setting up two well chambers 2, accurate flow monitoring is achieved using liquid level data, eliminating the inaccuracies of flow monitoring under non-full pipe flow conditions. Furthermore, the detection data is unaffected by suspended solids in the water. While one well chamber 2 monitors flow, the other chamber 2 discharges water, thus accurately measuring the core indicator of the drainage system—flow rate—without affecting the discharge of rainwater and sewage. During discharge, the closure of the inlet of this well chamber 2 will not cause water accumulation and flooding in the pipes. Controlling the valves based on the water volume changes per unit time from the start of water storage to selective discharge can reduce the interference of instantaneous flow or water quality changes on the control system, making flow measurement more accurate. Moreover, the discharge after water storage has a strong impact force, providing a certain degree of flushing effect on the rainwater pipe 6 and the sewage pipe 8.

[0061] Specifically, the rainwater inlets of the two manholes 2 are connected to the rainwater pipe 6 through rainwater branch pipes, and the sewage inlets of the two manholes 2 are connected to the sewage pipe 8 through sewage branch pipes. The two manholes 2 have the same structure and are independent of each other. The drainage through the rainwater pipe 6 flows into the surface water outlet. The height of the water inlet of the manhole 2 is higher than the height of the sewage inlet and the rainwater inlet, which can better realize water storage and flow monitoring. The states of the first control valve 3, the second control valve 5 and the third control valve 7 are regulated by the control system.

[0062] The well chamber inlet flow monitoring method provided in this embodiment is as follows: when water is introduced, the first control valve 3 opens, the second control valve 5 and the third control valve 7 close, and the liquid level rises; when the liquid level rises to a first threshold, the control system controls the first control valve 3 to close and the second control valve 5 and the third control valve 7 to open for discharge. At this time, the opening degree of the second control valve 5 and the third control valve 7 in one well chamber 2 is related to the liquid level rise time, i.e., the flow rate, during the water storage process in the other well chamber 2, and the opening degree of the second control valve 5 and the third control valve 7 is adjusted in real time according to the flow rate.

[0063] The water inflow rate in well chamber 2 is:

[0064]

[0065] △h is the height of the liquid level rise, S is the cross-sectional area of ​​well chamber 2, and △t is the time taken for the liquid to rise to the height △h.

[0066] like Figures 1 to 3 As shown, the flow metering interception well provided in this embodiment has two well chambers 2 arranged adjacent to each other. The first control valve 3 is a three-way control valve with two outlets. The inlet of the first control valve 3 is connected to the water inlet pipe 4, and one outlet of the first control valve 3 is connected to one well chamber 2, while the other outlet is connected to the other well chamber 2. This enables the first control valve 3 to simultaneously control the water inlets of both well chambers 2. The structure is simple and the control is convenient. The first control valve provided in this embodiment is an electromagnetic switching valve, which has a fast response speed, high accuracy, and simple structure. The water inlets on the two well chambers 2 are arranged close to each other and are simultaneously connected to the water inlet pipe 4 through the first control valve 3. Alternatively, as an alternative implementation, the first control valve 3 can also be an independent valve, controlled separately by a control system to control different water inlets of the two well chambers 2.

[0067] like Figure 1 and Figure 2 As shown, in the flow metering interception well provided in this embodiment, each of the well chambers 2 is equipped with a second control valve 5 on its rainwater outlet. The flow rate of the rainwater outlet is controlled by the second control valve 5. The second control valve 5 controls the flow rate of the corresponding rainwater outlet. They are set independently and do not affect each other. They are controlled accordingly when the well chamber 2 is discharging.

[0068] The second control valve 5 provided in this embodiment is an electrically operated upward-opening gate valve. When the flow rate is small, it can allow water to pass through without fully opening, reducing time and energy consumption. Alternatively, as an alternative implementation, the second control valve 5 can also be an electrically operated downward-opening gate valve or an electrically operated rotary gate valve, etc.

[0069] like Figure 1 and Figure 2 As shown, in the flow metering interception well provided in this embodiment, a third control valve 7 is respectively installed on the sewage outlet of each well chamber 2. The flow rate of the sewage outlet is controlled by the third control valve 7. The third control valve 7 controls the flow rate of the corresponding sewage outlet independently and does not affect each other. The interception and adjustment of rainwater and sewage in the well chamber 2 is realized according to the inlet flow rate.

[0070] The third control valve 7 provided in this embodiment is an electrically operated upward-opening gate valve. When the flow rate is small, it can allow water to pass through without fully opening, reducing time and energy consumption. Alternatively, as an alternative implementation, the third control valve 7 can also be an electrically operated downward-opening gate valve or an electrically operated rotary gate valve, etc.

[0071] like Figure 1 As shown in the figure, the flow metering interception well provided in this embodiment includes a monitoring system that further includes a rainfall detection element 10. The rainfall detection element 10 is electrically connected to the control system. Based on the monitoring data of the rainfall detection element, the control system controls the inlet and outlet of the interception well to coordinate accordingly. When rainfall is detected, the control system controls the two well chambers 2 to alternately store and release water. The rainfall detection element 10 is installed on the ground and is a rainfall sensor or rain gauge.

[0072] like Figures 1 to 3 As shown, this embodiment also provides a control method for a flow metering interception well, which adopts the flow metering interception well described in any of the above embodiments, including a first mode in which the two well chambers 2 sequentially cycle water storage and discharge.

[0073] When the first well chamber 2 is filled with water, the inlet of the second well chamber 2 is closed, and water is only introduced into the first well chamber 2. The outlet of the first well chamber 2 is also closed. The liquid level in the first well chamber 2 is monitored in real time by the liquid level detection device 9 located in the first well chamber 2 of the monitoring system, and the liquid level data is transmitted to the control system. The control system calculates the flow rate data of the liquid inlet based on the changes in the liquid level data.

[0074] While the first well chamber 2 is storing water, the second well chamber 2 discharges water through the rainwater pipe 6 and / or the sewage pipe 8.

[0075] When the liquid level in the first well chamber 2 reaches the first threshold, the inlet of the first well chamber 2 is closed and the inlet of the second well chamber 2 is opened, switching to water storage through the second well chamber 2 and water discharge through the first well chamber 2; the setting of the first threshold makes the alternation node of water storage and discharge the height of the liquid level, which can adapt to different flow rates of liquid inlet, and the first threshold is the high value in the well chamber 2.

[0076] During the water storage process in the second well chamber 2, the liquid level detection element 9 of the monitoring system located in the second well chamber 2 monitors the liquid level in the second well chamber 2 in real time and transmits the liquid level data to the control system. The control system calculates the inlet flow rate data based on the changes in the liquid level data.

[0077] When the liquid level in the second well chamber 2 reaches the first threshold, the inlet of the second well chamber 2 is closed and the inlet of the first well chamber 2 is opened, switching back to water storage through the first well chamber 2 and water discharge through the second well chamber 2, and so on.

[0078] While one well chamber 2 monitors the flow rate, the other well chamber 2 discharges water, thus achieving accurate measurement of the core indicator of flow rate in the drainage system without affecting the discharge of rainwater and sewage. Control valves are adjusted based on the water volume changes per unit time from the start of water storage to selective discharge, which can reduce the interference of instantaneous flow rate or water quality changes on the control system to a certain extent, making flow measurement more accurate. The use of two well chambers 2 allows for accurate flow rate monitoring using liquid level data, eliminating the inaccuracies of flow rate monitoring under non-full pipe conditions, and the detection data is unaffected by suspended solids in the water. Furthermore, the discharge after water storage has a strong impact force, providing a certain degree of flushing effect on the rainwater pipe 6 and the sewage pipe 8.

[0079] The control method for the flow metering interception well provided in this embodiment involves adjusting the interception ratio of the discharging well 2 in real time based on the calculated influent flow rate data from another well 2 that is storing water, when the well 2 is discharging. According to the flow rate data, the opening and closing sizes of the second control valve 5 and the third control valve 7 of the discharging well 2 are adjusted to achieve different flow control and distribution between the sewage pipe and the rainwater pipe, realizing the separation of rainwater and sewage, ensuring the stability of the drainage system, and minimizing the operational burden on the sewage treatment plant while intercepting pollutants as much as possible.

[0080] The interception ratio refers to the ratio of the amount of rainwater intercepted by the combined sewer system during rainfall to the amount of sewage flowing through dry areas. The amount of rainwater that does not flow out from the interception well is called the interception ratio.

[0081] The control method for the flow metering interception well provided in this embodiment, when the well chamber 2 discharges water, the control program of the control system is as follows:

[0082] When the rainfall is zero, the third control valve 7 connected to the sewage pipe 8 is fully open, and the second control valve 5 connected to the rainwater pipe 6 is closed; all incoming water is discharged through the sewage pipe 8 without water storage or flow monitoring.

[0083] When the rainfall is greater than zero and the influent flow rate increases to Q1, the control system controls the second control valve 5 to open wider and the third control valve 7 to close narrower, thereby partially intercepting the flow and controlling the flow distribution between the sewage pipe 8 and the rainwater pipe 6 to adjust the interception ratio.

[0084] The control method for the flow metering interception well provided in this embodiment involves controlling the second control valve 5 to fully open and the third control valve 7 to fully close when the influent flow rate in well chamber 2 increases to Q2 (Q2 is greater than Q1). At this point, it is assumed that the rainfall is significant, posing a risk of flooding. Furthermore, due to rainwater dilution, the concentration of pollutants in the incoming water is typically low. Therefore, priority should be given to ensuring rainwater discharge to prevent clean rainwater from entering the sewage pipe 8 and affecting the sewage treatment plant's operation. Specifically, after the influent flow rate in well chamber 2 increases to Q2, the flow rate needs to remain at or above Q2 for a certain period. The control system then controls the second control valve 5 to fully open and the third control valve 7 to fully close. This prevents adverse effects such as failing to intercept polluted water when only a momentary flow rate exceeds Q2 and the subsequent inflow is less than Q2. Therefore, it is generally recommended to monitor the flow rate for approximately 30 seconds (determined based on actual operating conditions) to maintain it at or above Q2 before controlling the second control valve 5 to fully open and the third control valve 7 to fully close.

[0085] The control method for the flow metering interception well provided in this embodiment involves switching from the first mode to the second mode when the inflow rate in well chamber 2 increases to the alarm value Q3 (Q3 is greater than Q2). In the second mode, the inlets of both well chambers 2 are opened simultaneously, and both well chambers 2 discharge water simultaneously. During the discharge process, the control system continues to fully open the second control valve 5 and fully close the third control valve 7 to ensure flood control safety. Specifically, when the inflow rate in well chamber 2 increases to the alarm value Q3, the flow rate needs to remain at or above Q3 for a certain period before switching from the first mode to the second mode. This avoids adverse effects caused by changing the interception and discharge strategy when only a momentary flow rate reaches Q3 and the subsequent inflow is less than Q3. Therefore, it is generally set to monitor the flow rate for approximately 30 seconds (determined according to actual operating conditions) until it remains at or above Q3 before switching to the second mode, allowing both well chambers 2 to discharge water simultaneously.

[0086] The control method for the flow metering interception well provided in this embodiment involves the control system switching from the second mode to the first mode when the flow has been released for a period of time or the rainfall decreases. This involves monitoring the flow in well chamber 2 to determine if the flow rate exceeds the alarm value Q3. If it does, the system switches from the first mode to the second mode, allowing simultaneous flow from both well chambers 2. If the flow rate is below the alarm value, the system continues in the first mode. This control system's switching between the first and second modes ensures the safety of the interception well and maintains it in an appropriate flow release state. The monitoring of Q3 is as described above; if the flow rate remains at or above Q3 for a certain period, the system switches from the first mode to the second mode.

[0087] The control method for the flow metering interception well provided in this embodiment detects rainfall through the rainfall detection device 10, and the control system controls the size of the second control valve 5 and the third control valve 7 in the discharge chamber 2 according to the detected rainfall.

[0088] The control program of the control system is as follows:

[0089] (1) No rainfall (sunny day mode): When the rainfall is zero: the first control valve 3 and the third control valve 7 are always fully open, the second control valve 5 is always fully closed, and all incoming water is discharged through the sewage pipe 8. At this time, water storage and flow monitoring are not performed. If there is still an inflow or flow measurement is required on a sunny day due to groundwater infiltration or other reasons, water storage and flow monitoring can be performed manually by adjusting the control mode through the control cabinet or remote control.

[0090] (2) In the early stage of rainfall (first rain mode), when the rainfall is greater than zero: the rainfall detection device 10 detects the rainfall signal and transmits it to the control system, and starts to enter the rainfall control mode. The control valve starts to enter the flow monitoring and circulation interception flow mode. Generally speaking, the incoming water in the first 20 minutes of rainfall (set according to the actual working conditions) is still completely intercepted to the sewage pipe 8, and the second control valve 5 is kept closed; the incoming water after 20 minutes is based on the flow rate Q measurement result. When the flow rate increases to Q1, combined with the control logic preset by the control system, the opening of the third control valve 7 and the second control valve 5 is adjusted each time the two sewage outlets and rainwater outlets are opened, the flow distribution ratio and flow rate are controlled, thereby regulating the interception multiple. Within a certain time range (such as within 2 hours after rainfall), it is considered that there is still pollution in the incoming water, so a partial interception strategy is adopted for the incoming water.

[0091] (3) Continuous rainfall (discharge mode): As rainfall continues, when the rainfall lasts for 2 hours or the flow rate increases to Q2 and continues for a certain period of time (set according to actual working conditions), it is considered that the water quality of the incoming water basically meets the requirements for direct discharge. At this time, the third control valve 7 will not be opened in each cycle to avoid increasing the operating pressure of the sewage treatment plant. Discharge will only be carried out through the second control valve 5, and the flow rate will be monitored.

[0092] (4) Rainstorm (Flood Discharge Mode): When the flow rate and rainfall exceed the alarm value Q3 and continue for a certain period of time, the circulating interception flow mode and flow monitoring will no longer be performed. At this time, the third control valve 7 will always be closed, the first control valve 3 and the second control valve 5 will be fully open, and the two well chambers 2 will be filled simultaneously to ensure flood discharge safety. After a period of flood discharge or when the rainfall is detected to be reduced, the flow rate can be monitored again to determine whether the inflow flow rate is still higher than the alarm value. If it is higher, the flood discharge will continue. If it is lower than the alarm value, it will be restored to (3) discharge mode.

[0093] (5) Rainfall stops: When the rainfall is detected to be 0 and the water flow is 0 or returns to the sunny flow (for a certain period of time, such as more than 2 hours), the control system automatically returns to (1) sunny mode.

[0094] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A flow metering type interception well, characterized in that, include: The well body (1) includes two well chambers (2), which are respectively connected to the water inlet pipe (4) through the first control valve (3), the rainwater pipe (6) through the second control valve (5), and the sewage pipe (8) through the third control valve (7). The monitoring system includes two liquid level detection elements (9), which are respectively installed in the two well chambers (2) for monitoring the liquid level in the well chambers (2); The control system is electrically connected to the first control valve (3), the second control valve (5), the third control valve (7) and the monitoring system. When either of the two well chambers (2) is storing water, the control system calculates the flow rate of the liquid entering the well based on the liquid level data in that well chamber (2).

2. The flow metering interception well according to claim 1, characterized in that, The two well chambers (2) are arranged adjacent to each other. The first control valve (3) is a three-way control valve with two outlets. The inlet of the first control valve (3) is connected to the water inlet pipe (4). One outlet of the first control valve (3) is connected to one of the well chambers (2), and the other outlet is connected to the other well chamber (2).

3. The flow metering interception well according to claim 2, characterized in that, The first control valve (3) is an electromagnetic switching valve.

4. The flow metering interception well according to claim 1, characterized in that, Each well chamber (2) is provided with a second control valve (5) on its rainwater outlet, and the flow rate of the rainwater outlet is controlled by the second control valve (5).

5. The flow metering interception well according to claim 4, characterized in that, The second control valve (5) is an electrically operated upward-opening gate.

6. The flow metering interception well according to claim 1, characterized in that, Each of the well chambers (2) is provided with a third control valve (7) at its sewage outlet, and the flow rate of the sewage outlet is controlled by the third control valve (7).

7. The flow metering interception well according to claim 6, characterized in that, The third control valve (7) is an electrically operated upward-opening gate.

8. The flow metering interception well according to any one of claims 1-7, characterized in that, The monitoring system also includes a rainfall detection device (10), which is electrically connected to the control system.

9. A control method for a flow metering intercepting well, characterized in that: The flow metering interception well according to any one of claims 1-8 includes a first mode in which the two well chambers (2) are used for water storage and discharge in sequence. When the first well chamber (2) is storing water, the inlet of the second well chamber (2) is closed, and water is only introduced into the first well chamber (2). The outlet of the first well chamber (2) is also closed. The liquid level in the first well chamber (2) is monitored in real time by the liquid level detection device (9) located in the first well chamber (2) of the monitoring system, and the liquid level data is transmitted to the control system. The control system calculates the flow rate data of the liquid inlet based on the liquid level data. While the first well chamber (2) is storing water, the second well chamber (2) is discharging water through the rainwater pipe (6) and / or the sewage pipe (8); When the liquid level in the first well chamber (2) reaches the first threshold, the system switches to storing water through the second well chamber (2) and releasing water from the first well chamber (2). During the water storage process in the second well chamber (2), the liquid level detection device (9) of the monitoring system located in the second well chamber (2) monitors the liquid level in the second well chamber (2) in real time and transmits the liquid level data to the control system. The control system calculates the inlet flow rate data based on the liquid level data. When the liquid level in the second well chamber (2) reaches the first threshold, the system switches back to storing water through the first well chamber (2) and releasing water through the second well chamber (2), and so on.

10. The control method for a flow metering intercepting well according to claim 9, characterized in that, When the well chamber (2) is releasing water, the control system adjusts the interception ratio of the well chamber (2) to be releasing water according to the calculated flow rate data.

11. The control method for a flow metering intercepting well according to claim 10, characterized in that, When the well chamber (2) discharges water, the control program of the control system is as follows: When the rainfall is zero, the third control valve (7) connected to the sewage pipe (8) is fully open, and the second control valve (5) connected to the rainwater pipe (6) is closed. When the rainfall is greater than zero and the inlet flow rate increases to Q1, the control system controls the second control valve (5) to open wider and the third control valve (7) to close smaller, thereby adjusting the interception ratio.

12. The control method for a flow metering intercepting well according to claim 11, characterized in that, When the inlet flow rate in the well chamber (2) increases to Q2, Q2 is greater than Q1, the control system controls the second control valve (5) to be fully opened and controls the third control valve (7) to be fully closed.

13. The control method for a flow metering intercepting well according to claim 12, characterized in that, When the inlet flow rate in well chamber (2) increases to the alarm value Q3, Q3 is greater than Q2, the first mode changes to the second mode. In the second mode, the inlets of the two well chambers (2) are opened at the same time, and the two well chambers (2) discharge water at the same time.

14. The control method for a flow metering intercepting well according to claim 13, characterized in that, When the flow is released for a period of time or the rainfall decreases, the control system switches from the second mode to the first mode to monitor the flow in the well chamber (2) and determine whether the flow is higher than the alarm value Q3. If it is higher, the system switches from the first mode to the second mode to release the flow in both well chambers (2) at the same time. If it is lower, continue with the first mode.

15. The control method for a flow metering intercepting well according to any one of claims 11-14, characterized in that, The rainfall is detected by the rainfall detection device (10), and the control system controls the size of the second control valve (5) and the third control valve (7) in the discharge chamber (2) according to the detected rainfall.

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