Low-flow monitoring device and method based on pipeline diameter shrinkage and liquid level difference change

Abstract

The invention provides a low flow monitoring device and method based on pipeline diameter shrinkage and liquid level difference change, the device comprises a pipeline diameter shrinkage assembly, an overflowing pipeline assembly and a water diversion anti-hanging assembly, the water diversion anti-hanging assembly is connected to the upper end of the overflowing pipeline assembly, the pipeline diameter shrinkage assembly is connected to the lower end of the overflowing pipeline assembly in a sealed mode, and the pipeline diameter shrinkage assembly is connected to the lower end of the overflowing pipeline assembly in a sealed mode. The pipeline reducing assembly comprises a silica gel pipeline, an inflatable rubber ring and a flow velocity sensor, the inflatable rubber ring is arranged in the silica gel pipeline, an inflation valve is arranged on the inflatable rubber ring, the inflatable rubber ring is used for controlling the pipe diameter change of the silica gel pipeline through inflation and deflation, and the flow velocity sensor is located in the silica gel pipeline. The device is used for measuring fluid flow velocity in a silica gel pipeline. The pipe diameter can be flexibly adjusted according to the water quantity of the drainage pipe network to be measured, a non-full pipe flow state is changed into a full pipe flow state, and the flow monitoring precision is effectively improved.

Description

Technical Field

[0001] The present invention belongs to the field of urban drainage flow monitoring, and relates to a low flow monitoring sensing device based on pipeline diameter reduction and liquid level difference change and a use method thereof. Background Art

[0002] The drainage network is an important infrastructure in the city. It is responsible for transferring the sewage generated by each drainage household in the city. Its stability plays a vital role in the safe operation of the city. Since the drainage network is usually buried deep underground and has a strong concealment, it is impossible to intuitively understand the specific operation status inside the network. It is necessary to use various monitoring equipment to measure and assist relevant units in the operation, maintenance and management of the drainage network based on accurate and reliable monitoring data.

[0003] The drainage network is divided into trunk pipes, main pipes and branch pipes. The branch pipes are directly connected to each drainage household, and there are problems such as low flow and low liquid level. In the specific monitoring process, the existing flow monitoring equipment is usually used for pipelines with relatively large flow and liquid level such as the main pipes and trunk pipes of the drainage network. When used to measure the flow of a single drainage household, there are problems such as low flow, large measurement error or inability to measure. Therefore, how to obtain high-precision flow data of low-flow drainage networks has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The purpose of the present invention is to address the defects of the prior art and provide a low flow monitoring device and method based on pipe diameter reduction and liquid level difference change. The device and method can be used to obtain accurate flow data under low flow and low liquid level conditions in a drainage network.

[0005] In a first aspect of the present invention, a low flow monitoring device based on pipeline reduction and liquid level difference change is provided, comprising a pipeline reduction component, a flow pipe component and a water diversion anti-hanging component, wherein the water diversion anti-hanging component is connected to the upper end of the flow pipe component, and the pipeline reduction component is sealed and connected to the lower end of the flow pipe component; wherein, The pipeline diameter reduction assembly includes a silicone pipeline, an inflatable rubber ring and a flow rate sensor. The inflatable rubber ring is arranged in the silicone pipeline, and an inflatable valve is arranged on the inflatable rubber ring. The inflatable rubber ring is used to control the diameter change of the silicone pipeline by inflating and deflating air. The flow rate sensor is located inside the silicone pipeline and is used to measure the flow rate of the fluid in the silicone pipeline. The flow pipe assembly includes a fixed pipe and two liquid level sensors, the two liquid level sensors are respectively located at two ends of the fixed pipe and are used to measure the liquid levels at the two ends of the fixed pipe; The water diversion anti-hanging component is used to prevent debris from entering the flow pipe component.

[0006] Preferably, the water diversion anti-hanging assembly includes an open pipe and an anti-hanging and pollution-preventing grid, and the anti-hanging and pollution-preventing grid is connected to one end of the open pipe.

[0007] Preferably, the anti-fouling grid is made of hemp rope.

[0008] Preferably, the surface of the anti-fouling grid is coated with a rubber layer to increase its waterproofness.

[0009] Preferably, the open pipe is trumpet-shaped, the end with a smaller radius is connected to the fixed pipe in the flow pipe assembly, the end with a larger radius is used to collect all water in the pipe to be tested, and the anti-fouling grid is connected to the end with a larger radius of the open pipe.

[0010] Preferably, the fixed pipe is a PVC pipe.

[0011] Preferably, the inflatable rubber ring is placed in the inner middle section of the silicone pipe.

[0012] Preferably, the water diversion anti-hanging assembly is detachably connected to the upper end of the flow pipe assembly.

[0013] Preferably, the pipe reducing assembly is detachably connected to the lower end of the flow pipe assembly.

[0014] The second aspect of the present invention provides a low flow monitoring method based on pipeline diameter reduction and liquid level difference change, using a low flow monitoring device based on pipeline diameter reduction and liquid level difference change, specifically comprising: S1: Based on the safety principle of preventing overflow, determine the specific diameter of the pipe reduction component. The specific steps are as follows: S1.1 Based on the water consumption data of drainage households, estimate the drainage volume during the measurement period. The calculation formula is as follows: ; in, is the water inflow flow of the drainage pipe network of the drainage household; k is the drainage coefficient; water consumption data for drainage users; S1.2 Combined with the estimated water volume in the area, calculate the maximum pipe diameter of the pipe diameter reduction equipment. The specific calculation formula is as follows: ; Among them, V out To monitor the outlet flow rate in the equipment; is the level difference between the highest liquid level in the upstream water inflow section and the center point of the equipment outlet; g is the acceleration of gravity; d is the pipe diameter; Q in is the water flow rate in the pipeline; t is the overflow warning time in the upstream; S2: According to the flow rate of the pipeline to be measured, the inflatable rubber ring in the pipeline reduction component is inflated, and the pipe diameter is estimated based on step S1. Under the condition of ensuring a certain flow capacity, the pipeline reduction component is ensured to be in full pipe flow, and the actual pipe diameter of the pipeline reduction device at this time is recorded; S3: After the water is diverted for a period of time and enters a stable operating state, extract the flow rate sensor reading in the pipe reduction component, and calculate the actual flow through the pipe reduction device in combination with the pipe diameter. The flow calculation formula is: ; in, is the actual flow rate in the pipe reduction device, is the actual flow rate in the pipe reduction device, is the actual diameter of the pipe reduction equipment; S4: Calculate the flow rate entering the pipe reduction component. The specific steps are as follows: S4.1: Extract the liquid level readings of the liquid level sensors at both ends of the flow pipe device at two times respectively, and calculate the water storage volume in the pipe based on the liquid level readings at both ends. The calculation formula is as follows: ; in, is the water storage volume of the pipeline at a specified time; f(x) is the calculation formula for the water-passing section; The upstream liquid level of the flow pipe device; It is the downstream liquid level of the flow pipe device; It is the upstream water flow cross-sectional area of ​​the flow pipe device; is the cross-sectional area of ​​the downstream of the flow pipe device; d is the diameter of the flow pipe device; l is the length of the flow pipe device; i is the length of the unfilled part of the pipe; is the slope of the pipeline to be measured; It is the water inflow of the drainage pipe network of the drainage household; is the outlet flow of the monitoring device; t is the length of the monitoring window; It is the water storage capacity of the pipe network; The calculation formula for the water flow cross-sectional area of ​​the flow pipe component is as follows: ; Where A is the cross-sectional area of ​​the pipe; is the pipe diameter; Fill the angle for the pipe; for water depth; S4.2: Combine the water storage capacity and water storage time of the pipe network to obtain the flow rate that does not enter the pipe reduction device. The specific calculation formula is as follows: ; in, It is the flow accumulated in the flow pipe device; is the water storage capacity of the flow pipe device during the measurement period; t is the measurement time; S5: Combine the flow calculated in steps S3 and S4 to form the final drainage volume of the drainage household. The specific calculation formula is as follows: ; in, It is the water inflow of the drainage pipe network of the drainage household; It is the flow accumulated in the flow pipe device; To monitor the outlet flow of the device.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a low flow monitoring device and method based on pipe diameter reduction and liquid level difference change. 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, and change the non-full pipe flow state into a full pipe flow state, thereby effectively improving the flow monitoring accuracy.

[0016] The present invention can effectively obtain the volume of water that has not entered the pipeline reduction device due to water gushing by calculating the change in liquid volume in the flow pipe device, and can effectively obtain this part of the flow rate by combining the overall measurement time.

[0017] The present invention provides a water diversion anti-hanging 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 flow state of the water body, thereby protecting the measurement accuracy of the equipment.

[0018] The overall equipment consists of three components, namely the water diversion anti-hanging component, the flow pipe component and the pipe reduction component. The measurement process is simple to install. You only need to place the equipment at the bottom of the pipe to be tested. At the same time, the three components are detachable and easy to carry. They can be flexibly moved and installed during actual use, which improves the flexibility and convenience of equipment use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the invention.

[0020] Figure 2 The present invention is a schematic structural diagram of a water diversion and anti-hanging assembly in one embodiment.

[0021] In the figure: 10, pipe 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 anti-hanging assembly; 31, open pipe; 32, anti-hanging grid. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred implementation scheme of the present invention is described below in conjunction with specific embodiments. However, it should be understood that the drawings are only used for exemplary descriptions and cannot be understood as limitations on this patent; in order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted; the positional relationship described in the drawings is only used for exemplary descriptions and cannot be understood as limitations on this patent.

[0023] As an embodiment of the present invention, see the attached Figure 1-Figure 2 The present embodiment provides a low flow monitoring device based on pipeline reduction and liquid level difference change, including a pipeline reduction component 10, a flow pipe component 20 and a water diversion anti-hanging component 30, wherein the water diversion anti-hanging component 30 is connected to the upper end of the flow pipe component 20, and the pipeline reduction component 10 is sealed and connected to the lower end of the flow pipe component 20, wherein the sealed connection refers to the downstream pipe mouth sealing of the flow pipe component, and the pipeline reduction component is connected to the port of the flow pipe component; wherein, The pipeline diameter reduction assembly 10 includes a silicone pipeline 11, an inflatable rubber ring 12 and a flow rate sensor 13. The inflatable rubber ring 12 is arranged in the silicone pipeline 11. The inflatable rubber ring 12 is provided with an inflation valve. The inflatable rubber ring 12 is used to control the diameter change of the silicone pipeline 11 by inflation and deflation. The flow rate sensor 13 is located inside the silicone pipeline 11 and is used to measure the flow rate of the fluid in the silicone pipeline 11. The flow pipe assembly 20 includes a fixed pipe 21 and two liquid level sensors 22. The two liquid level sensors 22 are respectively located at two ends of the fixed pipe 21 and are used to measure the liquid levels at the two ends of the fixed pipe 21. The water diversion anti-hanging component 30 is used to prevent debris from entering the flow pipe component 20.

[0024] Specifically, in the above embodiment, the water diversion anti-hanging assembly 30 includes an open pipe 31 and an anti-hanging grid 32 , and the anti-hanging grid 32 is connected to one end of the open pipe 31 .

[0025] In some preferred embodiments, the anti-fouling grid 32 is made of hemp rope, and of course, it can also be made of metal materials such as stainless steel.

[0026] In order to increase its waterproof property, in this embodiment, the surface of the anti-fouling grid 32 is coated with a rubber layer.

[0027] In some embodiments, the open pipe 31 is trumpet-shaped, the end with a smaller radius is connected to the fixed pipe 21 in the flow pipe assembly 20, and the end with a larger radius is used to collect all water in the pipe to be tested, and the anti-fouling grid 32 is connected to the end with a larger radius of the open pipe 31.

[0028] In some embodiments, the fixed pipe 31 is a PVC pipe. Other pipe materials, such as stainless steel pipe, may be used according to the needs of the usage scenario and the convenience of detection. For the convenience of the detection process, concrete pipes are generally not suitable.

[0029] Specifically, the inflatable rubber ring 12 is placed in the inner middle section of the silicone pipe.

[0030] In some embodiments, in order to facilitate flexible assembly of equipment before testing, and disassembly and transportation of equipment after testing, the water diversion anti-hanging assembly 30 in this embodiment is detachably connected to the upper end of the flow pipe assembly 20, where the upper end refers to the direction of water flow, with the upstream being the upper end and the downstream being the lower end.

[0031] 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 reduction assembly 10 in this embodiment is detachably connected to the lower end of the flow pipe assembly 20.

[0032] The use process of the above preferred embodiment, i.e., a low flow monitoring method based on pipeline diameter reduction and liquid level difference change, and a low flow monitoring device based on pipeline diameter reduction and liquid level difference change, specifically includes: S1: Based on the safety principle of preventing overflow, determine the specific diameter of the pipe reduction component. The specific steps are as follows: S1.1 Based on the water consumption data of drainage households, estimate the drainage volume during the measurement period. The calculation formula is as follows: ; in, is the water inflow flow of the drainage pipe network of the drainage household; k is the drainage coefficient; water consumption data for drainage users; S1.2 Combined with the estimated water volume in the area, calculate the maximum pipe diameter of the pipe diameter reduction equipment. The specific calculation formula is as follows: ; Among them, V out To monitor the outlet flow rate in the equipment; is the level difference between the highest liquid level in the upstream water inflow section and the center point of the equipment outlet; g is the acceleration of gravity; d is the pipe diameter; Q in is the water flow rate in the pipeline; t is the overflow warning time in the upstream; S2: According to the flow rate of the pipeline to be measured, the inflatable rubber ring in the pipeline reduction component is inflated, and the pipe diameter is estimated based on step S1. Under the condition of ensuring a certain flow capacity, the pipeline reduction component is ensured to be in full pipe flow, and the actual pipe diameter of the pipeline reduction device at this time is recorded; S3: After the water is diverted for a period of time and enters a stable operating state, extract the flow rate sensor reading in the pipe reduction component, and calculate the actual flow through the pipe reduction device in combination with the pipe diameter. The flow calculation formula is: ; in, is the actual flow rate in the pipe reduction device, is the actual flow rate in the pipe reduction device, is the actual diameter of the pipe reduction equipment; S4: Calculate the flow rate entering the pipe reduction component. The specific steps are as follows: S4.1: Extract the liquid level readings of the liquid level sensors at both ends of the flow pipe device at two times respectively, and calculate the water storage volume in the pipe based on the liquid level readings at both ends. The calculation formula is as follows: ; in, is the water storage volume of the pipeline at a specified time; f(x) is the calculation formula for the water-passing section; The upstream liquid level of the flow pipe device; It is the downstream liquid level of the flow pipe device; It is the upstream water flow cross-sectional area of ​​the flow pipe device; is the cross-sectional area of ​​the downstream of the flow pipe device; d is the diameter of the flow pipe device; l is the length of the flow pipe device; i is the length of the unfilled part of the pipe; is the slope of the pipeline to be measured; It is the water inflow of the drainage pipe network of the drainage household; is the outlet flow of the monitoring device; t is the length of the monitoring window; It is the water storage capacity of the pipe network; The calculation formula for the water flow cross-sectional area of ​​the flow pipe component is as follows: ; Where A is the cross-sectional area of ​​the pipe; is the pipe diameter; Fill the angle for the pipe; for water depth; S4.2: Combine the water storage capacity and water storage time of the pipe network to obtain the flow rate that does not enter the pipe reduction device. The specific calculation formula is as follows: ; in, It is the flow accumulated in the flow pipe device; is the water storage capacity of the flow pipe device during the measurement period; t is the measurement time; S5: Combine the flow calculated in steps S3 and S4 to form the final drainage volume of the drainage household. The specific calculation formula is as follows: ; in, It is the water inflow of the drainage pipe network of the drainage household; It is the flow accumulated in the flow pipe device; To monitor the outlet flow of the device.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A low flow monitoring device based on pipeline diameter reduction and liquid level difference change, characterized in that: It includes a pipe diameter reduction component, a flow pipe component and a water diversion anti-hanging component, wherein the water diversion anti-hanging component is connected to the upper end of the flow pipe component, and the pipe diameter reduction component is sealed and connected to the lower end of the flow pipe component; wherein, The pipeline diameter reduction assembly includes a silicone pipeline, an inflatable rubber ring and a flow rate sensor. The inflatable rubber ring is arranged in the silicone pipeline, and an inflatable valve is arranged on the inflatable rubber ring. The inflatable rubber ring is used to control the diameter change of the silicone pipeline by inflating and deflating air. The flow rate sensor is located inside the silicone pipeline and is used to measure the flow rate of the fluid in the silicone pipeline. The flow pipe assembly includes a fixed pipe and two liquid level sensors, the two liquid level sensors are respectively located at two ends of the fixed pipe and are used to measure the liquid levels at the two ends of the fixed pipe; The water diversion anti-hanging component is used to prevent debris from entering the flow pipe component.

2. A low flow monitoring device based on pipeline diameter reduction and liquid level difference change according to claim 1, characterized in that: The water diversion anti-hanging component comprises an open pipe and an anti-hanging grid, and the anti-hanging grid is connected to one end of the open pipe.

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

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

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

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

7. The low flow monitoring device based on pipeline diameter reduction and liquid level difference change according to claim 1 is characterized in that: The inflatable rubber ring is placed in the inner middle section of the silicone pipe.

8. The low flow monitoring device based on pipeline diameter reduction and liquid level difference change according to claim 1 is characterized in that: The water diversion anti-hanging component is detachably connected to the upper end of the flow pipe component.

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

10. A low flow monitoring method based on pipeline diameter reduction and liquid level difference change, characterized in that: The low flow monitoring device based on pipeline diameter reduction and liquid level difference change according to any one of claims 1 to 9 specifically comprises: S1: Based on the safety principle of preventing overflow, determine the specific diameter of the pipe reduction component. The specific steps are as follows: S1.1 Based on the water consumption data of drainage households, estimate the drainage volume during the measurement period. The calculation formula is as follows: ； in, is the water inflow flow of the drainage pipe network of the drainage household; k is the drainage coefficient; water consumption data for drainage users; S1.2 Combined with the estimated water volume in the area, calculate the maximum pipe diameter of the pipe diameter reduction equipment. The specific calculation formula is as follows: ； Among them, V out To monitor the outlet flow rate in the equipment; is the level difference between the highest liquid level in the upstream water inflow section and the center point of the equipment outlet; g is the acceleration of gravity; d is the pipe diameter; Q in is the water flow rate in the pipeline; t is the overflow warning time in the upstream; S2: According to the flow rate of the pipeline to be measured, the inflatable rubber ring in the pipeline reduction component is inflated, and the pipe diameter is estimated based on step S1. Under the condition of ensuring a certain flow capacity, the pipeline reduction component is ensured to be in full pipe flow, and the actual pipe diameter of the pipeline reduction device at this time is recorded; S3: After the water is diverted for a period of time and enters a stable operating state, extract the flow rate sensor reading in the pipe reduction component, and calculate the actual flow through the pipe reduction device in combination with the pipe diameter. The flow calculation formula is: ； in, is the actual flow rate in the pipe reduction device, is the actual flow rate in the pipe reduction device, is the actual diameter of the pipe reduction equipment; S4: Calculate the flow rate entering the pipe reduction component. The specific steps are as follows: S4.1: Extract the liquid level readings of the liquid level sensors at both ends of the flow pipe device at two times respectively, and calculate the water storage volume in the pipe based on the liquid level readings at both ends. The calculation formula is as follows: ； in, is the water storage volume of the pipeline at a specified time; f(x) is the calculation formula for the water-passing section; The upstream liquid level of the flow pipe device; It is the downstream liquid level of the flow pipe device; It is the upstream water flow cross-sectional area of ​​the flow pipe device; is the cross-sectional area of ​​the downstream of the flow pipe device; d is the diameter of the flow pipe device; l is the length of the flow pipe device; i is the length of the unfilled part of the pipe; is the slope of the pipeline to be measured; It is the water inflow of the drainage pipe network of the drainage household; is the outlet flow of the monitoring device; t is the length of the monitoring window; It is the water storage capacity of the pipe network; The calculation formula for the water flow cross-sectional area of ​​the flow pipe component is as follows: ； Where A is the cross-sectional area of ​​the pipe; is the pipe diameter; Fill the angle for the pipe; for water depth; S4.2: Combine the water storage capacity and water storage time of the pipe network to obtain the flow rate that does not enter the pipe reduction device. The specific calculation formula is as follows: ； in, It is the flow accumulated in the flow pipe device; is the water storage volume of the flow pipe device during the measurement period; t is the measurement time; S5: Combine the flow calculated in steps S3 and S4 to form the final drainage volume of the drainage household. The specific calculation formula is as follows: ； in, It is the water inflow of the drainage pipe network of the drainage household; It is the flow accumulated in the flow pipe device; To monitor the outlet flow of the device.

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