A low flow monitoring device and method based on pipeline diameter reduction and liquid level difference change

Abstract

This invention proposes a low-flow monitoring device and method based on pipe diameter reduction and liquid level difference changes. The device includes a pipe diameter reduction assembly, a flow-through pipe assembly, and a water-diverting anti-snagging assembly. The water-diverting anti-snagging assembly is connected to the upper end of the flow-through pipe assembly, and the pipe diameter reduction assembly is sealed to the lower end of the flow-through pipe assembly. The pipe diameter reduction assembly includes a silicone pipe, an inflatable rubber ring, and a flow velocity sensor. The inflatable rubber ring is disposed inside the silicone pipe and has an inflation valve. The inflatable rubber ring is used to control the pipe diameter change of the silicone pipe by inflation and deflation. The flow velocity sensor is located inside the silicone pipe and is used to measure the fluid velocity within the silicone pipe. This invention can flexibly adjust the pipe diameter according to the water volume of the drainage network under test, changing a non-full pipe flow state to a full pipe flow state, effectively improving the accuracy of flow monitoring.

Description

Technical Field

[0001] This invention belongs to the field of urban drainage flow monitoring, and relates to a low flow monitoring and sensing device and its usage method based on pipe diameter reduction and liquid level difference changes. Background Technology

[0002] Drainage pipe networks are a vital urban infrastructure, responsible for transporting sewage generated by various urban users. Their stability plays a crucial role in the safe operation of the city. Because drainage pipe networks are typically buried deep underground, their concealed nature makes it difficult to directly observe their internal operations. Therefore, various monitoring devices are needed for measurement. Based on accurate and reliable monitoring data, relevant units can assist in the operation, maintenance, and management of the drainage pipe network.

[0003] Drainage pipe networks are divided into main pipes, branch pipes, and branch pipes. Branch pipes directly connect to individual drainage users and suffer from problems such as low flow rates and low liquid levels. In practical monitoring, existing flow monitoring equipment is typically used for main pipes and branch pipes in the drainage network, where flow rates and liquid levels are relatively high. When used to measure the flow rate of a single drainage user, it suffers from problems such as low flow rates, large measurement errors, or inability to measure at all. Therefore, obtaining high-precision flow data for low-flow drainage pipe networks has become an urgent technical problem to be solved. Summary of the Invention

[0004] The purpose of this invention is to address the deficiencies of existing technologies by providing a low-flow monitoring device and method based on pipe diameter reduction and liquid level difference changes. This device and method can be used to obtain accurate flow data under low-flow and low-liquid-level conditions in drainage pipe networks.

[0005] In a first aspect, the present invention provides a low-flow monitoring device based on pipe diameter reduction and liquid level difference changes, comprising a pipe diameter reduction assembly, a flow-through pipe assembly, and a water-diverting anti-snagging assembly, wherein the water-diverting anti-snagging assembly is connected to the upper end of the flow-through pipe assembly, and the pipe diameter reduction assembly is sealed to the lower end of the flow-through pipe assembly; wherein,

[0006] The pipe diameter reduction assembly includes a silicone pipe, an inflatable rubber ring, and a flow rate sensor. The inflatable rubber ring is installed inside the silicone pipe and has an inflation valve. The inflatable rubber ring is used to control the change in the diameter of the silicone pipe by inflation and deflation. The flow rate sensor is located inside the silicone pipe and is used to measure the fluid flow rate inside the silicone pipe.

[0007] The flow-through pipe assembly includes a fixed pipe and two liquid level sensors, which are located at both ends of the fixed pipe and are used to measure the liquid level at both ends of the fixed pipe.

[0008] The water-diverting anti-snagging component is used to prevent debris from entering the flow pipe assembly.

[0009] Preferably, the water-diverting anti-snagging component includes an open pipe and an anti-snagging mesh, with the anti-snagging mesh connected to one end of the open pipe.

[0010] Preferably, the anti-fouling mesh is made of hemp rope.

[0011] Preferably, the surface of the anti-fouling mesh is coated with a rubber layer to increase its waterproofness.

[0012] Preferably, the open pipe is funnel-shaped, with the smaller radius end connected to the fixed pipe in the flow pipe assembly, and the larger radius end used to collect all the water in the pipe to be tested. The anti-fouling mesh is connected to the larger radius end of the open pipe.

[0013] Preferably, the fixed pipe is a PVC pipe.

[0014] Preferably, the inflatable rubber ring is placed in the middle section inside the silicone tube.

[0015] Preferably, the water-diverting anti-snagging component is detachably connected to the upper end of the flow-through pipe assembly.

[0016] Preferably, the pipe reduction assembly is detachably connected to the lower end of the flow pipe assembly.

[0017] A second aspect of the present invention provides a low-flow monitoring method based on pipe diameter reduction and liquid level difference changes, employing a low-flow monitoring device based on pipe diameter reduction and liquid level difference changes, specifically including:

[0018] S1: Determine the specific diameter of the pipe reduction assembly based on the safety principle of preventing overflow. The specific steps are as follows:

[0019] S1.1 Based on the water consumption data of drainage users, estimate the drainage volume for the measurement period. The calculation formula is as follows:

[0020] ;

[0021] in, is the inflow rate of the drainage pipe network for the drainage user; k is the drainage volume coefficient; For water consumption data of drainage users;

[0022] S1.2 Based on the estimated water inflow from the region, calculate the maximum pipe diameter of the pipe reduction equipment. The specific calculation formula is as follows:

[0023] ;

[0024] Among them, V out To monitor the outlet flow rate within the equipment; The difference between the highest liquid level in the upstream inflow section and the center point of the equipment outlet; g is the acceleration due to gravity; d is the pipe diameter; Qin t represents the inflow rate of the pipeline; t represents the warning time of the upstream overflow.

[0025] S2: Based on the flow rate of the pipe to be measured, inflate the inflatable rubber ring in the pipe reducing assembly, estimate the pipe diameter based on step S1, and ensure that the pipe reducing assembly is in full flow while ensuring a certain flow capacity. Record the actual pipe diameter of the pipe reducing equipment at this time.

[0026] S3: After the water has been diverted for a period of time and entered a stable operating state, extract the flow velocity sensor readings from the pipe diameter reduction assembly. Combined with the pipe diameter, calculate the actual flow rate through the pipe diameter reduction device. The flow rate calculation formula is:

[0027] ;

[0028] in, This represents the actual flow rate in the pipe reduction equipment. The actual flow velocity in the pipe reduction equipment. The actual diameter of the pipe reduction equipment;

[0029] S4: Calculate the flow rate entering the pipe reduction assembly. The specific steps are as follows:

[0030] S4.1: Extract the liquid level readings from the level sensors at both ends of the flow pipe device at two different times. Based on the liquid level readings at both ends, calculate the water storage volume in the pipe using the following formula:

[0031] ;

[0032] in, Let f(x) be the water volume stored in the pipeline at a specified time; f(x) is the formula for calculating the cross-sectional area of ​​the water passage. The upstream liquid level of the overflow pipeline device; This refers to the downstream liquid level of the overflow pipeline device. The cross-sectional area of ​​the upstream water passage of the overflow pipe device; d is the cross-sectional area of ​​the downstream flow passage of the flow passage device; l is the diameter of the flow passage device; i is the length of the flow passage device; and i is the length of the section of pipe that does not fully penetrate the pipe. The slope of the pipe to be measured; The inflow rate of the drainage pipe network for drainage users; t represents the outlet flow rate of the monitoring device; t represents the length of the monitoring window. For the water storage capacity of the pipeline network;

[0033] The formula for calculating the cross-sectional area of ​​the flow-through pipe assembly is as follows:

[0034] ;

[0035] Where A is the cross-sectional area of ​​the pipe through which water flows; The diameter of the pipe; Fill the pipe with an angle; For water depth;

[0036] S4.2: Combining the water storage volume and storage time of the pipeline network, the flow rate before entering the pipeline reduction equipment is obtained. The specific calculation formula is as follows:

[0037] ;

[0038] in, The flow rate stored in the flow pipe device; The measurement time represents the water storage volume of the overflow pipeline device during the specified time period; t is the measurement time.

[0039] S5: Combining the flow rates calculated in steps S3 and S4, the final drainage volume of the drainage user is determined. The specific calculation formula is as follows:

[0040] ;

[0041] in, The inflow rate of the drainage pipe network for drainage users; The flow rate stored in the flow pipe device; To monitor the outlet flow rate of the device.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] This invention provides a low-flow monitoring device and method based on pipe diameter reduction and liquid level difference changes. The pipe diameter reduction device has a built-in inflatable rubber ring, which can flexibly adjust the pipe diameter according to the water volume of the drainage network to be measured, turning a non-full pipe flow state into a full pipe flow state, effectively improving the accuracy of flow monitoring.

[0044] This invention can effectively obtain the volume of water that did not enter the pipe diameter reduction device due to water inrush by calculating the change in liquid volume within the flow pipe device. Combined with the overall measurement time, this part of the flow rate can be effectively obtained.

[0045] The present invention has a water-diverting and anti-snagging component at the device port, which can effectively block pollutants and impurities that may affect the measurement results of the monitoring equipment without affecting the water flow, thus protecting the measurement accuracy of the equipment.

[0046] The entire device consists of three parts: a water intake anti-snagging component, a flow pipe component, and a pipe diameter reduction component. The measurement process is simple to install; the device only needs to be placed at the bottom of the pipe to be measured. In addition, the three components are detachable, making them easy to carry and allowing for flexible movement and installation during actual use, thus improving the flexibility and convenience of the device. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the invention.

[0048] Figure 2 This is a schematic diagram of the structure of a water-diverting anti-snagging component in one embodiment of the invention.

[0049] In the diagram: 10. Pipe diameter reduction assembly; 11. Silicone pipe; 12. Inflatable rubber ring; 13. Flow rate sensor; 20. Flow pipe assembly; 21. Fixed pipe; Liquid level sensor; 30. Water diversion and anti-snagging assembly; 31. Open pipe; 32. Anti-snagging mesh. Detailed Implementation

[0050] To enable those skilled in the art to better understand the technical solutions of the present invention, the preferred embodiments of the present invention are described below in conjunction with specific examples. However, it should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting the present patent. To better illustrate the embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable for those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the present patent.

[0051] As one embodiment of the present invention, see the appendix. Figures 1-2 This embodiment provides a low-flow monitoring device based on pipe diameter reduction and liquid level difference changes, including a pipe diameter reduction assembly 10, a flow-through pipe assembly 20, and a water-diverting anti-snagging assembly 30. The water-diverting anti-snagging assembly 30 is connected to the upper end of the flow-through pipe assembly 20, and the pipe diameter reduction assembly 10 is sealed to the lower end of the flow-through pipe assembly 20. Here, the sealed connection means that the downstream pipe port of the flow-through pipe assembly is sealed, and the port of the pipe diameter reduction assembly is connected to the port of the flow-through pipe assembly.

[0052] The pipe diameter reduction assembly 10 includes a silicone pipe 11, an inflatable rubber ring 12, and a flow rate sensor 13. The inflatable rubber ring 12 is disposed inside the silicone pipe 11 and is equipped with an inflation valve. The inflatable rubber ring 12 is used to control the change in the diameter of the silicone pipe 11 by inflation and deflation. The flow rate sensor 13 is located inside the silicone pipe 11 and is used to measure the fluid flow rate inside the silicone pipe 11.

[0053] The flow pipe assembly 20 includes a fixed pipe 21 and two liquid level sensors 22, which are located at both ends of the fixed pipe 21 and are used to measure the liquid level at both ends of the fixed pipe 21.

[0054] The water-diverting anti-snagging component 30 is used to prevent debris from entering the flow pipe component 20.

[0055] Specifically, in the above embodiments, the water-diverting anti-snagging component 30 includes an open pipe 31 and an anti-snagging mesh 32, with the anti-snagging mesh 32 connected to one end of the open pipe 31.

[0056] In some preferred embodiments, the anti-fouling mesh 32 is made of hemp rope, but it can also be made of metal, such as stainless steel.

[0057] To increase its waterproofness, in this embodiment, the surface of the anti-fouling mesh 32 is coated with a rubber layer.

[0058] In some embodiments, the open pipe 31 is funnel-shaped, with the smaller radius end connected to the fixed pipe 21 in the flow pipe assembly 20, and the larger radius end used to collect all the water in the pipe to be tested. The anti-fouling mesh 32 is connected to the larger radius end of the open pipe 31.

[0059] In some embodiments, the fixed pipe 31 is a PVC pipe. Depending on the needs of the application scenario and the need for convenient testing, other pipe materials may also be used, such as stainless steel pipe. For the convenience of the testing process, concrete pipes are generally not recommended.

[0060] Specifically, the inflatable rubber ring 12 is placed in the middle section inside the silicone tube.

[0061] In some embodiments, in order to facilitate flexible assembly of the equipment before testing and disassembly and transportation of the equipment after testing, the water-guiding anti-snagging component 30 in this embodiment is detachably connected to the upper end of the flow pipe assembly 20. Here, the upper end refers to the upstream end and the downstream end according to the direction of water flow.

[0062] In some preferred embodiments, in order to facilitate flexible assembly of the equipment before testing, and disassembly and transportation of the equipment after testing, the pipe diameter reduction assembly 10 is detachably connected to the lower end of the flow pipe assembly 20 in this embodiment.

[0063] The usage process of the above preferred embodiment, namely a low flow monitoring method and a low flow monitoring device based on pipe diameter reduction and liquid level difference changes, specifically includes:

[0064] S1: Determine the specific diameter of the pipe reduction assembly based on the safety principle of preventing overflow. The specific steps are as follows:

[0065] S1.1 Based on the water consumption data of drainage users, estimate the drainage volume for the measurement period. The calculation formula is as follows:

[0066] ;

[0067] in, is the inflow rate of the drainage pipe network for the drainage user; k is the drainage volume coefficient; For water consumption data of drainage users;

[0068] S1.2 Based on the estimated water inflow from the region, calculate the maximum pipe diameter of the pipe reduction equipment. The specific calculation formula is as follows:

[0069] ;

[0070] Among them, V out To monitor the outlet flow rate within the equipment; The difference between the highest liquid level in the upstream inflow section and the center point of the equipment outlet; g is the acceleration due to gravity; d is the pipe diameter; Q in t represents the inflow rate of the pipeline; t represents the warning time of the upstream overflow.

[0071] S2: Based on the flow rate of the pipe to be measured, inflate the inflatable rubber ring in the pipe reducing assembly, estimate the pipe diameter based on step S1, and ensure that the pipe reducing assembly is in full flow while ensuring a certain flow capacity. Record the actual pipe diameter of the pipe reducing equipment at this time.

[0072] S3: After the water has been diverted for a period of time and entered a stable operating state, extract the flow velocity sensor readings from the pipe diameter reduction assembly. Combined with the pipe diameter, calculate the actual flow rate through the pipe diameter reduction device. The flow rate calculation formula is:

[0073] ;

[0074] in, This represents the actual flow rate in the pipe reduction equipment. The actual flow velocity in the pipe reduction equipment. The actual diameter of the pipe reduction equipment;

[0075] S4: Calculate the flow rate entering the pipe reduction assembly. The specific steps are as follows:

[0076] S4.1: Extract the liquid level readings from the level sensors at both ends of the flow pipe device at two different times. Based on the liquid level readings at both ends, calculate the water storage volume in the pipe using the following formula:

[0077] ;

[0078] in, Let f(x) be the water volume stored in the pipeline at a specified time; f(x) is the formula for calculating the cross-sectional area of ​​the water passage. The upstream liquid level of the overflow pipeline device; This refers to the downstream liquid level of the overflow pipeline device. The cross-sectional area of ​​the upstream water passage of the overflow pipe device; d is the cross-sectional area of ​​the downstream flow passage of the flow passage device; l is the diameter of the flow passage device; i is the length of the flow passage device; and i is the length of the section of pipe that does not fully penetrate the pipe. The slope of the pipe to be measured; The inflow rate of the drainage pipe network for drainage users; t represents the outlet flow rate of the monitoring device; t represents the length of the monitoring window. For the water storage capacity of the pipeline network;

[0079] The formula for calculating the cross-sectional area of ​​the flow-through pipe assembly is as follows:

[0080] ;

[0081] Where A is the cross-sectional area of ​​the pipe through which water flows; The diameter of the pipe; Fill the pipe with an angle; For water depth;

[0082] S4.2: Combining the water storage volume and storage time of the pipeline network, the flow rate before entering the pipeline reduction equipment is obtained. The specific calculation formula is as follows:

[0083] ;

[0084] in, The flow rate stored in the flow pipe device; The measurement time represents the water storage volume of the overflow pipeline device during the specified time period; t is the measurement time.

[0085] S5: Combining the flow rates calculated in steps S3 and S4, the final drainage volume of the drainage user is determined. The specific calculation formula is as follows:

[0086] ;

[0087] in, The inflow rate of the drainage pipe network for drainage users; The flow rate stored in the flow pipe device; To monitor the outlet flow rate of the device.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A low-flow monitoring method based on pipe diameter reduction and liquid level difference changes, characterized in that, A low-flow monitoring device based on pipe diameter reduction and liquid level difference changes is employed. It includes a pipe diameter reduction assembly, a flow-through pipe assembly, and a water-diverting anti-snagging assembly. The water-diverting anti-snagging assembly is connected to the upper end of the flow-through pipe assembly, and the pipe diameter reduction assembly is sealed and connected to the lower end of the flow-through pipe assembly. The pipe diameter reduction assembly includes a silicone pipe, an inflatable rubber ring, and a flow rate sensor. The inflatable rubber ring is installed inside the silicone pipe and has an inflation valve. The inflatable rubber ring is used to control the change in the diameter of the silicone pipe by inflation and deflation. The flow rate sensor is located inside the silicone pipe and is used to measure the fluid flow rate inside the silicone pipe. The flow-through pipe assembly includes a fixed pipe and two liquid level sensors, which are located at both ends of the fixed pipe and are used to measure the liquid level at both ends of the fixed pipe. The water-diverting anti-snagging component is used to prevent debris from entering the flow pipe assembly; The monitoring method specifically includes: S1: Determine the specific diameter of the pipe reduction assembly based on the safety principle of preventing overflow. The specific steps are as follows: S1.1 Based on the water consumption data of drainage users, estimate the drainage volume for the measurement period. The calculation formula is as follows: ； in, is the inflow rate of the drainage pipe network for the drainage user; k is the drainage volume coefficient; For water consumption data of drainage users; S1.2 Based on the estimated water inflow from the region, calculate the maximum pipe diameter of the pipe reduction equipment. The specific calculation formula is as follows: ； Among them, V out To monitor the outlet flow rate within the equipment; The difference between the highest liquid level in the upstream inflow section and the center point of the equipment outlet; g is the acceleration due to gravity; d is the pipe diameter; Q in t represents the inflow rate of the pipeline; t represents the warning time of the upstream overflow. S2: Based on the flow rate of the pipe to be measured, inflate the inflatable rubber ring in the pipe reducing assembly, estimate the pipe diameter based on step S1, and ensure that the pipe reducing assembly is in full flow while ensuring a certain flow capacity. Record the actual pipe diameter of the pipe reducing equipment at this time. S3: After the water has been diverted for a period of time and entered a stable operating state, extract the flow velocity sensor readings from the pipe diameter reduction assembly. Combined with the pipe diameter, calculate the actual flow rate through the pipe diameter reduction device. The flow rate calculation formula is: ； in, This represents the actual flow rate in the pipe reduction equipment. The actual flow velocity in the pipe reduction equipment. The actual diameter of the pipe reduction equipment; S4: Calculate the flow rate entering the pipe reduction assembly. The specific steps are as follows: S4.1: Extract the liquid level readings from the level sensors at both ends of the flow pipe device at two different times. Based on the liquid level readings at both ends, calculate the water storage volume in the pipe using the following formula: ； in, Let f(x) be the water volume stored in the pipeline at a specified time; f(x) is the formula for calculating the cross-sectional area of ​​the water passage. The upstream liquid level of the overflow pipeline device; This refers to the downstream liquid level of the overflow pipeline device. The cross-sectional area of ​​the upstream water passage of the overflow pipe device; d is the cross-sectional area of ​​the downstream flow passage of the flow passage device; l is the diameter of the flow passage device; i is the length of the flow passage device; and i is the length of the section of pipe that does not fully penetrate the pipe. The slope of the pipe to be measured; The inflow rate of the drainage pipe network for drainage users; t represents the outlet flow rate of the monitoring device; t represents the length of the monitoring window. For the water storage capacity of the pipeline network; The formula for calculating the cross-sectional area of ​​the flow-through pipe assembly is as follows: ； Where A is the cross-sectional area of ​​the pipe through which water flows; The diameter of the pipe; Fill the pipe with an angle; For water depth; S4.2: Combining the water storage volume and storage time of the pipeline network, the flow rate before entering the pipeline reduction equipment is obtained. The specific calculation formula is as follows: ； in, The flow rate stored in the flow pipe device; The measurement time represents the water storage volume of the overflow pipeline device during the specified time period; t is the measurement time. S5: Combining the flow rates calculated in steps S3 and S4, the final drainage volume of the drainage user is determined. The specific calculation formula is as follows: ； in, The inflow rate of the drainage pipe network for drainage users; The flow rate stored in the flow pipe device; To monitor the outlet flow rate of the device.

2. The low-flow monitoring method based on pipe diameter reduction and liquid level difference change according to claim 1, characterized in that: The water diversion anti-snagging component includes an open pipe and an anti-snagging mesh, with the anti-snagging mesh connected to one end of the open pipe.

3. The low-flow monitoring method based on pipe diameter reduction and liquid level difference change according to claim 2, characterized in that: The anti-fouling mesh is made of hemp rope.

4. The low-flow monitoring method based on pipe diameter reduction and liquid level difference change according to claim 2, characterized in that: The surface of the anti-fouling mesh is coated with a rubber layer to increase its waterproofness.

5. The low-flow monitoring method based on pipe diameter reduction and liquid level difference change according to claim 2, characterized in that: The open pipe is funnel-shaped, with the smaller radius end connected to the fixed pipe in the flow pipe assembly, and the larger radius end used to collect all the water in the pipe to be tested. The anti-fouling mesh is connected to the larger radius end of the open pipe.

6. The low-flow monitoring method based on pipe diameter reduction and liquid level difference change according to claim 1, characterized in that: The fixed pipe is a PVC pipe.

7. The low-flow monitoring method based on pipe diameter reduction and liquid level difference change according to claim 1, characterized in that: The inflatable rubber ring is placed in the middle section inside the silicone tube.

8. The low-flow monitoring method based on pipe diameter reduction and liquid level difference change according to claim 1, characterized in that: The water-diverting anti-snagging component is detachably connected to the upper end of the flow-through pipe assembly.

9. The low-flow monitoring method based on pipe diameter reduction and liquid level difference change according to claim 1, characterized in that: The pipe reduction assembly is detachably connected to the lower end of the flow pipe assembly.

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