Unfull pipe integrated flow measurement device and method

Abstract

The present invention relates to the technical field of open channel flow measurement, and in particular to a non-full pipe integrated flow measurement device and method, the device comprising a flow measurement module, a liquid level measurement module, a device box and a controller, the flow measurement module is arranged on both sides of the device box, and is used to measure the flow velocity value signal of the water flow in the device box, the liquid level measurement module is arranged at the water outlet of the device box, and is used to measure the liquid level value signal of the water flow in the device box, the controller is respectively connected to the flow measurement module and the liquid level measurement module, and is used to calculate the water flow rate passing through the box according to the acquired flow velocity value signal and liquid level value signal. The purpose of the present invention is to provide a non-full pipe integrated flow measurement device and method, so as to solve the problems that the existing open channel flow measurement equipment can only measure the flow of the full pipe or the non-full pipe flow measurement is inaccurate, has a single function and a low integration.

Description

Technical Field

[0001] The present invention relates to the technical field of open channel flow measurement, and in particular to a full-pipe integrated flow measurement device and method. Background Art

[0002] Open channel flow monitoring data is an important parameter in actual production and life. In the existing technology, the equipment used in open channel automatic monitoring and control has too single functions, low integration and low measurement accuracy. It takes a variety of equipment to complete a project for simple measurement. This not only increases the project cost, but also makes installation and debugging very cumbersome. Deployment requires a lot of space, many accessories, and maintenance is also very inconvenient. In addition, installing too many devices will also bring about complex system wiring and reliability issues.

[0003] Therefore, in view of the above problems, it is necessary to provide an integrated flow measuring device and method for a non-full pipe, which can not only measure the flow velocity of an open channel, but also accurately measure the liquid level of the open channel, thereby improving the measurement accuracy of small flow rates. Summary of the invention

[0004] The object of the present invention is to provide a partially full pipe integrated flow measuring device and method to solve the problems that the existing open channel flow measuring equipment can only measure the flow of a fully full pipe, has a single function and a low integration level.

[0005] In order to achieve the above object, the technical solution of the present invention is as follows:

[0006] A non-full pipe integrated flow measuring device comprises a flow measurement module, a liquid level measurement module, a device box and a controller, wherein the flow measurement modules are arranged on both sides of the device box and are used to measure the flow velocity value signal of the water flow in the device box, the liquid level measurement module is arranged at the water outlet of the device box and is used to measure the liquid level value signal of the water flow in the device box, and the controller is respectively connected to the flow measurement module and the liquid level measurement module and is used to calculate the water flow rate passing through the box according to the acquired flow velocity value signal and liquid level value signal.

[0007] Preferably, the flow measurement module comprises a transducer mounting plate and a transducer, wherein the transducer mounting plate is arranged at one end of two side plates of the device housing, and the transducer is embedded in the transducer mounting plate.

[0008] Preferably, the transducers are densely arranged near the bottom of the transducer mounting plate, and the transducers are sparsely arranged near the top of the transducer mounting plate.

[0009] Preferably, the liquid level measurement module includes an ultrasonic distance measurement sensor module and a capacitive liquid level sensor module, and the controller is connected to the flow measurement sensor module, the ultrasonic distance measurement sensor module and the capacitive liquid level sensor module via a 485 bus.

[0010] Preferably, the device box is a square box, with a water inlet pouring piece and a water outlet pouring piece provided at the front and back, and a fishbone pouring outlet is provided on the water pouring piece.

[0011] A method for measuring and controlling a non-full pipe integrated flow measuring device comprises the following steps:

[0012] Install the non-full pipe integrated flow measuring device in the open channel to be measured;

[0013] By judging whether there is flow rate or water status, it is determined whether data collection is needed, and the controller is switched between low power mode and wake-up mode;

[0014] Determine the small flow and siltation conditions, and comprehensively process the transducer signal to monitor the flow rate of the liquid in the device box in real time;

[0015] The controller records and processes the collected flow rate value and liquid level value signals, and then uploads the data to the cloud through the wireless communication module.

[0016] Preferably, the method further comprises the following steps:

[0017] When there is water flow, the controller is in wake-up mode, collects flow data in real time, stores it in time, and then reports the data once at T1. When there is no water flow, the controller is in low power consumption mode, and reports the data once at T2.

[0018] The controller is provided with a fitting relationship Q=H*W*V among liquid level, flow velocity and flow rate, where H is the liquid level height, W is the width, V is the average flow velocity of the cross section, and when the controller reads the liquid level and flow velocity values, the real-time flow rate is calculated through the fitting relationship.

[0019] Preferably, the real-time flow rate is calculated by fitting the relationship, further comprising: making a fitting curve as a three-segment linear test, Y=A(XB), where X represents the measured linear velocity, Y is the fitted cross-sectional surface velocity, and A and B are coefficients;

[0020] At different speeds V1, V2, and V3, there are A1\B1, A2\B2, and A3\B3. By selecting different fitting formulas in different speed regions ([0, V1], [V1, V2], [V2, V3]), speed correction can be achieved.

[0021] Preferably, the correction of the liquid level further includes zero point calibration and full scale calibration of the two liquid levels, obtaining the liquid level area [Hmin, Hmax] through the signal of the flow sensor, and simultaneously measuring the non-contact liquid level H1 and the contact liquid level H2 to determine whether the liquid level is normal and determine the final liquid level H value.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. The present invention adopts the measurement and control method to allow the controller to switch between low power consumption mode and wake-up mode, and adopts a solar power supply solution to save energy; the present invention adopts an intelligent reporting method to speed up the collection frequency and reduce the reporting interval when there is water flow, and reduce the collection frequency or not collect and increase the reporting interval when there is no water flow.

[0024] 2. The present invention arranges transducer mounting plates on both sides of the device housing, and the transducers are mounted on the transducer mounting plates, using a low-density and high-sparse arrangement to improve the accuracy of flow measurement under low liquid level and small flow rate.

[0025] 3. The present invention integrates liquid level measurement and flow rate measurement to form an integrated flow measuring device, which has the characteristics of small footprint, easy installation and disassembly, and long service life.

[0026] 4. The present invention transmits the collected flow velocity value and liquid level value signal to the controller; the controller is provided with a fitting relationship Q=H*W*V among liquid level, flow velocity and flow rate, where H is the liquid level height, W is the width, and V is the average flow rate of the cross section. When the controller reads the liquid level and flow velocity values, the real-time flow rate is calculated through the fitting relationship, thus forming a method of measuring flow without full pipe, which is accurate and reliable.

[0027] 5. The present invention installs the liquid level measurement module in the water pouring plate cavity of the square box water outlet, and the water pouring plate is provided with a fishbone water outlet to improve the anti-blocking ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural diagram of a non-full pipe integrated flow measuring device in the present invention;

[0029] Figure 2 for Figure 1 The transducer arrangement diagram of a non-full pipe integrated flow measuring device is shown;

[0030] Figure 3 for Figure 1 The electrical connection diagram of an integrated flow measuring device for a partially filled pipe is shown;

[0031] Description of reference numerals:

[0032] 1-water inlet backflow plate, 2-square box, 3-flow measurement module, 4-transducer, 5-liquid level measurement module, 6-water outlet backflow plate cavity, 7-water outlet backflow plate, 8-controller, 9-transparent protective cover. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiment is a module embodiment of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] 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.

[0035] like Figure 1 As shown, this embodiment provides an integrated flow measuring device for a full pipe, including an inlet backflow plate 1, a square box 2, a flow measurement module 3, a transducer 4, a liquid level measurement module 5, a water outlet backflow plate cavity 6, a water outlet backflow plate 7, a controller 8, and a transparent protective cover 9. The inlet backflow plate 1 is fastened to the front end of the square box 2 by screws to ensure that the water flows stably into the square box 2; the water outlet backflow plate 7 is fixed to the rear end of the square box 2 by screws, and a fishbone water outlet is provided on the water outlet backflow plate 7 to prevent silt accumulation. The liquid level measurement module 5 is installed in the water outlet backflow plate cavity 6. Block 5, the liquid level measurement module 5 adopts a redundant design of a contact capacitance liquid level measurement method and a non-contact ultrasonic measurement method, and combines the measurement to improve the accuracy and stability; a plurality of transducer mounting plates are nested on both sides of the inner notch of the square box 2 by screws, and the transducer 4 is mounted on the mounting plate with screws, and a square hole groove is opened on the top of the square box 2, and the controller 8 is installed by snap-fit, and the controller 8 is electrically connected to the flow measurement module 3 and the liquid level measurement module 5 respectively for collecting and controlling data; the transparent protective cover 9 is provided on the outside of the controller 8 to prevent the controller 8 from being damaged.

[0036] like Figure 2As shown, further, in a non-full pipe integrated flow measuring device disclosed in an embodiment, a plurality of layers of transducers 4 are arranged on the transducer mounting plate, and the arrangement spacing of the transducers 4 is different, wherein the spacing L0≤L1≤L2≤L3≤L4≤L5≤L6, and the spacing near the bottom is smaller than the spacing near the top. The transducer 4 can improve the accuracy of small flow measurement through a low-density and high-sparse arrangement.

[0037] like Figure 3 As shown, further, in a non-full pipe integrated flow measuring device disclosed in the embodiment, the controller is connected to the solar panel, lithium battery, controller, flow measuring sensor module, ultrasonic ranging sensor module, capacitive liquid level sensor module, wireless communication module, and GPRS module. The controller is connected to the flow measuring sensor module, ultrasonic ranging sensor module, and capacitive liquid level sensor module through a 485 bus, and a controllable power supply is used to power each module, thereby reducing power consumption; the solar panel and lithium battery are connected to the controller to power the controller; the wireless module and GPRS module are integrated on the controller, and the wireless module adopts the lora wireless solution, which can transmit device data through Lora or GPRS to realize remote wireless monitoring function.

[0038] An integrated flow measurement method for a non-full pipe of the present invention is as follows:

[0039] The square box is fixed at a certain position in the open channel, and various components including the controller are installed. The bottom transducer determines the flow size and siltation situation, and comprehensively processes the transducer signal to monitor the flow velocity value of the liquid flowing in the square box in real time; the liquid level measurement module monitors the liquid level value of the square box in real time, and transmits the collected flow velocity value and liquid level value signal to the controller; the real-time flow rate is calculated by the formula inside the controller; the controller can determine whether it is necessary to collect by judging whether there is a flow rate or water state, so that the controller can switch between low power consumption mode and wake-up mode to save power consumption; when there is water flow, the controller wakes up mode, collects flow data in real time, and stores it in time, and then reports the data once at T1 time, such as 1h-3h. When there is no water flow, the controller is in low power consumption mode and reports the data once at T2 time. T2 time is greater than T1 time, such as 6-10h, to save power consumption.

[0040] Furthermore, in an integrated flow measurement method for a partially full pipe disclosed in an embodiment, a method for obtaining a liquid level and a method for obtaining a flow rate are provided. For example: This solution makes a fitting curve for 3-segment linear calibration according to the actual situation, Y=A(XB), where X represents the measured linear velocity, Y is the fitted cross-sectional surface velocity, and under different speeds V1, V2, and V3, there are A1\B1, A2\B2, and A3\B3, and different fitting formulas are selected in different speed areas ([0, V1], [V1, V2], [V2, V3]) to achieve speed correction; for the correction of the liquid level, the two liquid levels will first be calibrated at zero point and full scale to ensure the accuracy and precision of the individual measurements; but due to the unstable water flow fluctuations at the application site, the measured data will be offset too much and will lead to inaccurate measurements, so two methods and flow sensors are used for data integration and mutual verification; we can obtain the approximate liquid level area [Hmin, Hmax] through the signal of the flow sensor, and measure the non-contact liquid level H1 and the contact liquid level H2 at the same time. Through the software analysis book, we can judge whether the liquid level is normal and determine the final liquid level H Value (may be (H1+H2) / 2, H1, H2, [Hmin, Hmax] intermediate value, etc.) After knowing the liquid level data and cross-sectional flow velocity, we can get the flow rate through Q=H*W*V.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for the modules or all the technical features therein. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An integrated flow measuring device for a non-full pipe, characterized in that: It includes a flow measurement module, a liquid level measurement module, a device box and a controller. The flow measurement module is arranged on both sides of the device box, and is used to measure the flow velocity value signal of the water flow in the device box. The liquid level measurement module is arranged at the water outlet of the device box, and is used to measure the liquid level value signal of the water flow in the device box. The controller is connected to the flow measurement module and the liquid level measurement module respectively, and is used to calculate the water flow rate passing through the box according to the acquired flow velocity value signal and liquid level value signal. The flow measurement module includes a transducer mounting plate and a transducer, wherein the transducer mounting plate is arranged at one end of two side plates of the device box, and the transducer is embedded in the transducer mounting plate; The transducers are densely arranged near the bottom of the transducer mounting plate, and sparsely arranged near the top of the transducer mounting plate; The transducer mounting plate is provided with multiple layers of transducers, and the arrangement spacing of the transducers is different, wherein the spacing is L0≤L1≤L2≤L3≤L4≤L5≤L6, and the spacing near the bottom is smaller than the spacing near the top; Wherein, a plurality of transducer mounting plates are nested on both sides of the inner notch of the device box by screws, the transducer is mounted on the mounting plate by screws, a square hole is opened on the top of the device box, the controller is mounted by snaps, and the controller is electrically connected to the flow measurement module and the liquid level measurement module respectively; The liquid level measurement module includes an ultrasonic distance measurement sensor module and a capacitive liquid level sensor module, and the controller is connected with the flow measurement sensor module, the ultrasonic distance measurement sensor module and the capacitive liquid level sensor module through a 485 bus; Wherein, the liquid level measurement module adopts a redundant design of a contact-type capacitance liquid level measurement method and a non-contact ultrasonic measurement method for combined measurement; The controller is connected to a solar panel, a lithium battery, a controller, a flow sensor module, an ultrasonic distance sensor module, a capacitive liquid level sensor module, a wireless communication module, and a GPRS module. The controller is connected to the flow sensor module, the ultrasonic distance sensor module, and the capacitive liquid level sensor module through a 485 bus, and a controllable power supply is used to power each module. The solar panel and the lithium battery are connected to the controller to power the controller. The controller is integrated with a wireless module and a GPRS module. The wireless module adopts a lora wireless solution to transmit device data through Lora or GPRS. The device box is a square box, with a water inlet pouring piece and a water outlet pouring piece at the front and back, and a fishbone pouring outlet on the pouring piece; Among them, a non-full pipe integrated flow measurement device also includes a water outlet pouring plate cavity and a transparent protective cover, and the transparent protective cover is provided outside the controller; Among them, the water inlet backflow plate is fastened to the front end of the device box by screws; the water outlet backflow plate is fixed to the rear end of the device box with screws, and a fishbone water outlet is provided on the water outlet backflow plate, and the liquid level measurement module is installed in the cavity of the water outlet backflow plate.

2. A method for measuring and controlling the non-full pipe integrated flow measuring device according to claim 1, characterized in that: The following steps are involved: Install the non-full pipe integrated flow measuring device in the open channel to be measured; By judging whether there is flow rate or water status, it is determined whether data collection is needed, and the controller is switched between low power mode and wake-up mode; Determine the small flow and siltation conditions, and comprehensively process the transducer signal to monitor the flow rate of the liquid in the device box in real time; The controller adopts a fitting relationship of liquid level, flow velocity and flow rate Q=H*W*V, where H is the liquid level height, W is the width, V is the average flow velocity of the cross section, and Q is the flow rate. When the controller reads the liquid level and flow rate values, the real-time flow rate is calculated through the fitting relationship; The real-time flow rate is calculated by fitting the relationship, further comprising: making a fitting curve as a three-segment linear test, Y=A(XB), where X represents the measured linear velocity, Y is the fitted cross-sectional surface velocity, and A and B are coefficients; At different speeds V1, V2, and V3, there are A1\B1, A2\B2, and A3\B3. By selecting different fitting formulas in different speed regions ([0, V1], [V1, V2], [V2, V3]), speed correction can be achieved. The correction of the liquid level further includes zero point calibration and full scale calibration of the two liquid levels, obtaining the liquid level area [Hmin, Hmax] through the signal of the flow sensor, and measuring the non-contact liquid level H1 and the contact liquid level H2 at the same time, judging whether the liquid level is normal and determining the final liquid level H value; Finally, the flow rate is obtained by Q = H*W*V; The controller records and processes the collected flow rate value and liquid level value signals, and then uploads the data to the cloud through the wireless communication module.

3. The measurement and control method of the non-full pipe integrated flow measuring device according to claim 2 is characterized in that: The following steps are also included: When there is water flow, the controller wakes up the mode, collects flow data in real time, stores it in time, and then reports the data once at T1. When there is no water flow, the controller switches to low power consumption mode and reports the data once at T2.

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