A flow detection system and maintenance method thereof

Abstract

The present invention relates to the technical field of flow detection, and specifically to a flow detection system and a maintenance method thereof. The flow detection system includes a mounting adapter, a rectifier box, an electromagnetic flowmeter and a water outlet elbow. The rectifier box is located on one side of the mounting adapter, and an opening is provided at the top thereof. A drainage pipeline is provided on one side thereof, and a functional sensor is integrated therein; the electromagnetic flowmeter is fixed on the drainage pipeline on one side of the rectifier box; the water outlet elbow is provided on one side of the electromagnetic flowmeter and away from the rectifier box, and the opening of the water outlet elbow is provided toward the top. The electromagnetic flowmeter has many advantages such as non-contact measurement, low requirements for the measured medium, wide measurement range, and high accuracy, and is widely used in various sewage flow measurement occasions. However, the electromagnetic flowmeter can only measure full pipe flow, and the sewage pipe is usually designed to be non-full pipe. By providing a water outlet elbow, the opening of the water outlet elbow is provided toward the top, so that the pipe is full of pipe flow, which meets the measurement requirements of the flow sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of flow detection, and in particular to a flow detection system and a maintenance method thereof. Background Art

[0002] To manage the urban water environment, eliminate black and odorous water bodies, and solve urban waterlogging, monitoring the operation of urban drainage pipe networks and continuously monitoring the water level and flow of pipe networks in real time are effective measures to solve the above problems. Analysis of flow data can identify overflow, infiltration and inflow in the pipeline. More importantly, pipe network flow is an important basic data for the management and dispatch of urban municipal pipe networks, and is also an important basis for the improvement of urban pipe network design. By selecting appropriate flow monitoring equipment, long-term stable and accurate flow data can be obtained.

[0003] So far, pipeline network flow detection mainly uses immersion Doppler flowmeters. Ultrasonic Doppler flowmeters use the Doppler frequency shift phenomenon generated by sound waves to calculate the fluid flow velocity for measurement.

[0004] The ultrasonic Doppler flowmeter is used to measure the flow of the drainage network. The probe is directly inserted into the drainage pipe for measurement. It has the advantages of easy installation and maintenance, little impact on pipe drainage, measurement of non-full pipes, and low cost. However, there are also some insurmountable defects:

[0005] 1. The ultrasonic Doppler flowmeter has low measurement accuracy and can only be used to measure liquids containing certain suspended particles and bubbles. If the flow channel medium changes, it will affect the measurement results;

[0006] 2. The measurement accuracy is very low, and the measurement error can be as high as 400% of the test flow;

[0007] 3. The measuring probe will be buried by the sludge accumulated at the bottom of the pipe, affecting the measurement;

[0008] 4. The measurement data has poor stability. The tiny vortex of the water flow at the probe will cause irregular fluctuations in the data, and special mathematical processing is required to obtain the measurement results. Summary of the invention

[0009] The object of the present invention is to provide a flow detection system and a maintenance method thereof, so as to solve the problem of low precision when using ultrasonic Doppler flowmeter for measurement in the prior art.

[0010] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is to provide a flow detection system, including a mounting adapter, a rectifier box, an electromagnetic flowmeter and a water outlet elbow, wherein the rectifier box is located on one side of the mounting adapter, has an opening at the top, and has a drainage pipe on one side, in which a functional sensor is integrated; the electromagnetic flowmeter is fixed on the drainage pipe on one side of the rectifier box; the water outlet elbow is arranged on one side of the electromagnetic flowmeter and away from the rectifier box, and the opening of the water outlet elbow is arranged toward the top.

[0011] Furthermore, it also includes a transmission module, and the electromagnetic flowmeter processes and converts the measured induced potential, which is then transmitted by the transmission module to a management platform located in the urban pipe network management agency.

[0012] Furthermore, the transmission module includes a distribution box, a transmitter, a data processor and a wireless signal transmission unit. The transmitter and the data processor convert the induced potential measured by the electromagnetic flowmeter into a standard signal output as a flow signal, and the wireless signal transmission unit transmits the standard signal to the management platform.

[0013] Furthermore, it also includes a power module, which includes a solar panel and a battery.

[0014] Furthermore, an overflow port is provided on one side of the opening of the rectifier box body, and the height of the plate body at the overflow weir port is lower than the height of the remaining plate bodies.

[0015] Furthermore, the rectifier box includes a mounting groove and a connecting plate, the connecting plate is slidably connected to the mounting groove, and the drainage pipeline and the electromagnetic flowmeter are provided on one side of the connecting plate.

[0016] Furthermore, a mounting bracket is provided on the rectifier box body, a radar level meter is provided on the mounting bracket, and the radar level meter is located above the opening of the rectifier box body.

[0017] Furthermore, the functional sensors include a liquid level meter, a sludge detector, a backwater detector, a turbulence detector and an oil pollution detector.

[0018] Furthermore, a maintenance method for a flow detection system is provided. To maintain the flow detection system described above, a pressure level gauge is installed at the bottom, middle, and 2 / 3 height of the rectifier box, respectively. Whether there is siltation is determined by abnormal pressure. Whether there is blockage is determined by abnormal Qh curve, which is the relationship between the backwater height and the flow meter flow. If blockage occurs, the functional sensor sends a blockage or siltation signal to remind the staff to maintain the system.

[0019] Furthermore, a maintenance method for a flow detection system is provided. For maintaining the flow detection system described above, a plurality of grilles are provided in the rectifier box along the vertical direction. The grille spacing is 5mm-20mm and is selected according to different sewage conditions. The liquid level difference before and after the grille is used to determine whether the rectifier box needs to be cleaned. When the liquid level difference is >5mm, the rectifier box is cleaned.

[0020] The beneficial effects of the present invention are:

[0021] 1. Electromagnetic flowmeter has many advantages such as non-contact measurement, low requirements for the measured medium, wide measurement range, high accuracy, etc., and is widely used in various sewage flow measurement occasions. However, electromagnetic flowmeter can only measure full pipe flow, and sewage pipes are usually designed to be non-full pipes. By setting the outlet elbow, the opening of the outlet elbow is set toward the top, so that the pipe is full of flow, which meets the measurement requirements of the flow sensor. At the same time, the rectifier box is in front of the electromagnetic flowmeter to separate the air and stabilize the water flow. When there is a large flow emergency inflow or the system is blocked, the upper opening of the rectifier box can overflow to ensure that the drainage of the pipe network is not affected.

[0022] 2. The size of the pipe network inspection well is usually very small, and the well chamber is usually only about 1m. When using an electromagnetic flowmeter to measure flow, the problem of installation in a narrow space must be solved. In the present invention, the installation adapter and the installation slot are installed on the measured pipe in advance and sealed. The connecting plate and the electromagnetic flowmeter are assembled on the well. The assembly is lifted to the well with a lifting rope, the position is adjusted, and the installation plate is plugged into the installation slot to realize the installation of the flow detection system. Workers do not need to enter the sewage pipe inspection well under harsh conditions. The flow detection device can be hoisted to the designated position from the wellhead. When disassembly is required, just lift the connecting plate out.

[0023] 3. The multifunctional sensor combination installed as needed can detect the liquid level, sludge accumulation, etc. in the pipeline and measurement system and provide timely alarm. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the overall structure of a flow detection system provided in Example 1;

[0026] Figure 2 A schematic diagram of the installation position of a flow detection system provided in Example 1;

[0027] Figure 3 A schematic diagram of the overall structure of a transmission module used in a flow detection system provided in Example 1.

[0028] Description of reference numerals:

[0029] 1. Installation adapter; 2. Rectifier box; 21. Overflow weir; 22. Installation groove; 23. Connection plate; 24. Installation bracket; 25. Radar level meter; 3. Drainage pipeline; 4. Electromagnetic flowmeter; 41. Header; 5. Water outlet elbow; 6. Transmission module; 61. Distribution box; 62. Transmitter; 63. Data processor; 64. Wireless signal transmission unit; 7. Power module; 71. Solar panel; 72. Battery; 8. Inspection well; 81. Water inlet; 82. Water outlet. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, 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.

[0034] Example 1

[0035] Reference Figure 1-Figure 3 As a flow detection system provided by an embodiment of the present invention, it includes an installation adapter 1, a rectifier box 2, an electromagnetic flowmeter 4 and a water outlet elbow 5. The rectifier box 2 is located on one side of the installation adapter 1, and an opening is provided at the top thereof. A drainage pipe 3 is provided on one side thereof, and a functional sensor is integrated therein; the electromagnetic flowmeter 4 is fixed on the drainage pipe 3 on one side of the rectifier box 2; the water outlet elbow 5 is arranged on one side of the electromagnetic flowmeter 4 and away from the rectifier box 2, and the opening of the water outlet elbow 5 is arranged toward the top. The electromagnetic flowmeter 4 has many advantages such as non-contact measurement, low requirements for the measured medium, wide measurement range, and high accuracy, and is widely used in various sewage flow measurement occasions. However, the electromagnetic flowmeter 4 can only measure full pipe flow, and the sewage pipe is usually designed to be non-full pipe. By setting the water outlet elbow 5, the opening of the water outlet elbow 5 is arranged toward the top, so that the pipe is full of pipe flow, which meets the measurement requirements of the flow sensor. At the same time, the rectifier box 2 is in front of the electromagnetic flowmeter 4, used to separate the air to stabilize the water flow. When a large flow rate urgently flows in or the system is blocked, the upper opening of the rectifier box 2 can overflow to ensure that the drainage of the pipe network is not affected.

[0036] Specifically, the electromagnetic flowmeter 4 is provided with a meter head 41 for displaying the flow rate. The flow detection system also includes a transmission module 6 and a power module 7. The electromagnetic flowmeter 4 processes and converts the measured induced potential, and then transmits it to the management platform located in the urban pipe network management agency by the transmission module 6. The transmission module 6 includes a distribution box 61, a transmitter 62, a data processor 63 and a wireless signal transmission unit 64. The transmitter 62 and the data processor 63 convert the induced potential measured by the electromagnetic flowmeter as a flow signal into a standard signal output, and the wireless signal transmission unit 64 uses 5G communication to transmit the standard signal to the management platform. The power module 7 continuously supplies power to the entire system, and the solar panel 71 converts clean solar energy into electrical energy and stores it in the battery 72 and powers the system during sunny days. At night or on rainy days, the battery 72 ensures the power supply of the system. The independent power supply system ensures that the entire measurement system is continuously and stably supplied with power regardless of weather conditions.

[0037] Furthermore, the rectifier box 2 includes a mounting groove 22 and a connecting plate 23 . The connecting plate 23 is slidably connected to the mounting groove 22 . A drainage pipeline 3 and an electromagnetic flowmeter 4 are provided on one side of the connecting plate 23 .

[0038] Specifically, the mounting adapter 1 is in the shape of a tube body, and the mounting adapter 1 and the mounting groove 22 are fixedly connected by welding. The bottom end of the mounting groove 22 is closed, the top end is open, and one side is provided with a mounting slideway. The connecting plate 23 can be plugged into the mounting slideway to achieve a fixed connection with the mounting groove 22. At this time, the mounting groove 22 and the connecting plate 23 enclose the rectifier box 2. The size of the pipe network inspection well 8 is usually very small, and the well chamber is usually only about 1m. When the electromagnetic flowmeter 4 is used to measure the flow, the problem of installation in a narrow space must also be solved. In the present invention, the mounting adapter 1 and the mounting groove 22 are pre-installed on the measured pipeline and sealed, and the connecting plate 23 and the electromagnetic flowmeter 4 are assembled on the well. The assembly is hoisted to the bottom of the inspection well 8 with a lifting rope, and the position is adjusted. The mounting plate is plugged into the mounting groove 22 to realize the installation of the flow detection system. Workers do not need to enter the sewage pipe inspection well 8 with harsh conditions. The flow detection device can be hoisted to the specified position from the wellhead. When disassembly is required, just hoist the connecting plate 23 out. The mounting adapter 1 is connected to the water inlet 81 of the inspection well 8 and is sealed with the pipe wall at the water inlet 81. One end of the water outlet elbow 5 is communicated with the water outlet 82 of the network management inspection well 8.

[0039] Furthermore, an overflow weir 21 is provided on one side of the opening of the rectifier box 2, and the height of the plate at the overflow is lower than that of the remaining plates.

[0040] Specifically, in this embodiment, an overflow weir 21 is provided on the connecting plate 23 to ensure that the overflow overflows from the side of the water flow direction. A mounting bracket 24 is provided on the rectifying box 2, and a radar level gauge 25 is provided on the mounting bracket 24. The radar level gauge 25 is located directly above the opening of the rectifying box 2. A static pressure level gauge is provided in the rectifying box 2 near the overflow weir 21, and another static pressure level gauge is provided on the side of the bottom of the rectifying box 2 away from the overflow weir 21. By measuring the liquid level in the rectifying box 2 and the weir liquid level, a calibration relationship between the two liquid levels and the weir coefficient C is established in the laboratory. The overflow amount is thus calculated.

[0041] Furthermore, the functional sensors include liquid level gauges, sludge detectors, backwater detectors, turbulence detectors and oil detectors. Functional sensors can provide a variety of detection, monitoring and early warning functions. The multifunctional sensor combination installed as needed can detect the liquid level, sludge accumulation and other conditions in the pipeline and measurement system and give timely alarms.

[0042] Furthermore, the entire measurement system is made of corrosion-resistant materials and can adapt to sewage systems containing corrosive or grease. The environmental conditions in the well are complex and there is sometimes methane. This measurement system adopts IP68 protection that meets explosion-proof requirements, which not only ensures that the system can operate safely underwater, but also reduces the risk of flow measurement.

[0043] The flow detection system provided by the embodiment of the present invention retains the advantages of the electromagnetic flowmeter 4. The non-contact measurement does not affect the drainage capacity of the pipeline. There is no structure in the pipeline that hinders the flow, which prevents it from being blocked by solid dirt in the sewage. The measurable flow range is large, the output signal is linearly related to the measured flow, and the accuracy is high. The entire measurement system is made of corrosion-resistant materials and can adapt to sewage systems containing corrosive or grease. After rectification, the entire detection system can ensure a constant and uniform flow state measured by the electromagnetic flowmeter 4. And through the optimization of the structure and installation method, the optimal size design of the system is achieved, which solves the problem that the electromagnetic flowmeter 4 cannot be installed in the narrow pipe network inspection well 8. Functional sensors can provide a variety of detection, monitoring, and early warning functions. The solar cell power supply system ensures long-term, continuous and stable power supply of the entire system under complex outdoor conditions. Wireless data transmission does not require manual reading in the well. The environmental conditions in the well are complex and there is sometimes methane. This measurement system adopts IP68 protection that meets the explosion-proof requirements, which not only ensures that the system can operate safely underwater, but also reduces the risk of flow measurement. It meets all requirements such as simple, accurate, and reliable operation and maintenance of the flowmeter.

[0044] Example 2

[0045] The embodiment of the present invention provides a maintenance method for a flow detection system. The flow detection system described in Example 1 is maintained by installing a pressure level gauge at the bottom, the middle, and the 2 / 3 height of the rectifier box 2, respectively. Whether there is siltation is determined by the abnormal pressure. Whether there is blockage is determined by the abnormality of the Qh curve, which is the relationship between the backwater height and the flow meter flow. If blockage occurs, the functional sensor sends a blockage or siltation signal to remind the staff to maintain the system.

[0046] Example 3

[0047] An embodiment of the present invention provides a maintenance method for a flow detection system. The flow detection system described in Example 1 is maintained. A plurality of grilles are provided in the vertical direction in the rectifier box 2. The grille spacing is 5 mm-20 mm. The grilles are selected according to different sewage conditions. The liquid level difference before and after the grilles is used to determine whether the rectifier box 2 needs to be cleaned. When the liquid level difference is >5 mm, the rectifier box 2 and the grilles are cleaned.

[0048] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A flow detection system, characterized in that: include: Mounting adapter (1); A rectifier box (2) is located on one side of the mounting adapter (1), has an opening at its top, and has a drainage pipeline (3) on one side, in which a functional sensor is integrated; An electromagnetic flowmeter (4) is fixed on the drainage pipeline (3) on one side of the rectifier box (2); A water outlet elbow (5) is arranged on one side of the electromagnetic flowmeter (4) and away from the rectifier box (2), and the opening of the water outlet elbow (5) is arranged toward the top; The rectifier box (2) comprises a mounting groove (22) and a connecting plate (23), wherein the connecting plate (23) is slidably connected to the mounting groove (22), and the drainage pipeline (3) and the electromagnetic flowmeter (4) are provided on one side of the connecting plate (23); The mounting adapter (1) and the mounting groove (22) are pre-installed on the measured pipeline and sealed, the connecting plate (23) and the electromagnetic flowmeter (4) are assembled on the well, the assembly is hoisted to the inspection well (8) by a hoisting rope, the position is adjusted, and the connecting plate (23) is plugged into the mounting groove (22) to realize the installation of the flow detection system; Wherein, a pressure level gauge is installed at the bottom, middle and 2 / 3 height of the rectifier box (2) respectively, and whether there is siltation is determined by pressure anomalies; whether there is blockage is determined by anomalies in the Qh curve, the relationship between the backwater height and the flow rate of the flow meter; if blockage occurs, the functional sensor sends a blockage or siltation signal to remind the staff to perform system maintenance; the functional sensors include a level gauge, a sludge detector, a backwater detector, a turbulence detector and an oil pollution detector; A plurality of grilles are arranged in the vertical direction in the rectifying box (2), and the grille spacing is 5 mm to 20 mm. The grilles are selected according to different sewage conditions. The difference in liquid level before and after the grilles is used to determine whether the rectifying box (2) needs to be cleaned. When the liquid level difference is greater than 5 mm, the rectifying box (2) is cleaned.

2. A flow detection system as claimed in claim 1, characterized in that: It also includes a transmission module (6), and the electromagnetic flowmeter (4) processes and converts the measured induced potential, which is then transmitted by the transmission module (6) to a management platform located in an urban pipe network management agency.

3. A flow detection system as claimed in claim 2, characterized in that: The transmission module (6) comprises a distribution box (61), a transmitter (62), a data processor (63) and a wireless signal transmission unit (64); the transmitter (62) and the data processor (63) convert the induced potential measured by the electromagnetic flowmeter (4) as a flow signal into a standard signal output; and the wireless signal transmission unit (64) transmits the standard signal to a management platform.

4. A flow detection system as claimed in claim 1, characterized in that: It also comprises a power module (7), wherein the power module (7) comprises a solar panel (71) and a storage battery (72).

5. A flow detection system as claimed in claim 1, characterized in that: An overflow weir (21) is provided on one side of the opening of the rectifier box (2), and the height of the plate at the overflow weir (21) is lower than the height of the remaining plates.

6. A flow detection system as claimed in claim 1, characterized in that: The rectifier housing (2) is provided with a mounting bracket (24), and the mounting bracket (24) is provided with a radar level meter (25), and the radar level meter (25) is located above the opening of the rectifier housing (2).

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