Flow measuring device

Abstract

The utility model discloses a flow measuring device, and belongs to the technical field of measuring instruments, the flow measuring device comprises a water inlet tank and a measuring tank, the water inlet tank and the measuring tank are arranged in parallel or up and down, the water inlet tank is provided with a water inlet tank inlet for water inflow, the water inlet tank is communicated with the measuring tank through a connecting pipe, and a drainage pipe is communicated with a measuring tank outlet preset at the bottom of the measuring tank. Valve assemblies are arranged on the connecting pipe and the drainage pipe, the valve assemblies are connected with the control module and are controlled to be opened and closed through the control module, a second liquid level detector used for monitoring the liquid level of the water inlet tank is arranged in the measuring box, and the liquid level detector is connected with the control module and transmits detected liquid level data to the control module. According to the device, the fluid volume is directly metered by adopting a volumetric method through the box-separated measuring cavity comprising the water inlet box and the measuring box, so that the device can realize high-precision measurement under full-pipe and non-full-pipe conditions.

Description

Technical Field

[0001] This application relates to the field of measuring instrument technology, and in particular, to a flow measurement device. Background Technology

[0002] The information provided in this section is for the purpose of generally presenting the background of this application. To the extent described in this section, the work of the currently named inventors and aspects of the description that may not constitute prior art at the time of filing are neither explicitly nor implicitly considered to be prior art of this application.

[0003] Traditional pipeline flow measurement devices, such as electromagnetic flow meters and ultrasonic flow meters, are typically only suitable for full-pipe conditions and cannot accurately measure flow rates in non-full-pipe conditions. Furthermore, some flow measurement devices suitable for non-full-pipe conditions, such as weir flow meters and flume flow meters, have lower measurement accuracy and suffer from problems such as complex installation and difficult maintenance.

[0004] In existing technologies, in fields such as municipal drainage, sewage treatment, and industrial wastewater, the fluid in pipelines typically exists in two states: a partially full pipe and a fully full pipe, or even a combination of both. Existing flow measurement devices have poor adaptability and limited versatility, making it difficult to meet actual needs.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0006] In view of at least one of the above technical problems, this application provides a flow measurement device that can directly measure the fluid volume using a volumetric method through a compartmentalized measurement chamber including an inlet tank, a measuring tank, and a control box, enabling the device to achieve high-precision measurement under both full and non-full pipe conditions.

[0007] According to one aspect of this application, a flow measurement device is provided, comprising an inlet tank, a measuring box, a control module, a connecting pipe, and a drain pipe:

[0008] The water inlet tank and the measuring tank are arranged side by side or one above the other. The water inlet tank has an inlet for water intake. The water inlet tank and the measuring tank are connected by a connecting pipe. The drain pipe is connected to the measuring tank outlet at the lower end of the measuring tank. Both the connecting pipe and the drain pipe are equipped with valve assemblies. The valve assemblies are connected to the control module and are controlled to open and close by the control module. A second liquid level detector is installed in the measuring tank to monitor the liquid level. The second liquid level detector is connected to the control module and transmits the detected liquid level data to the control module.

[0009] In some embodiments of this application, the valve assembly includes an inlet valve and a drain valve. The inlet valve is located on the connecting pipe and is used to open or close the connecting pipe. The drain valve is located on the drain pipe and is used to open or close the drain pipe.

[0010] In some embodiments of this application, the valve assembly further includes an inlet booster pump and a drain booster pump. The inlet booster pump is located on the connecting pipe and is used to increase the flow rate of the fluid in the connecting pipe. The drain booster pump is located on the drain pipe and is used to increase the drainage flow rate of the drain pipe.

[0011] In some embodiments of this application, the flow measurement device further includes a first liquid level detector disposed in the water inlet tank for monitoring the liquid level. The first liquid level detector is connected to the control module and transmits the detected liquid level data to the control module.

[0012] In some embodiments of this application, the first liquid level detector includes a first ultrasonic level gauge, which is disposed on the top of the water inlet tank; the second liquid level detector includes a second ultrasonic level gauge, which is disposed on the top of the measuring tank.

[0013] In some embodiments of this application, the water inlet tank and the measuring tank are arranged side by side. The top of the water inlet tank is provided with a removable water inlet tank cover, and the first ultrasonic level gauge is provided on the bottom surface of the water inlet tank cover. The top of the measuring tank is provided with a removable measuring tank cover, and the second ultrasonic level gauge is provided on the bottom surface of the measuring tank cover.

[0014] In some embodiments of this application, air vents are provided on both the water inlet tank cover and the measuring tank cover. The air vents are used to promote airflow in the water inlet tank and the measuring tank in order to balance the air pressure in the water inlet tank and the measuring tank.

[0015] In some embodiments of this application, the flow measurement device further includes a grid plate disposed at the lower part of the measuring chamber, which is used to break up air bubbles in the liquid inside the measuring chamber to promote the rise of air bubbles.

[0016] In some embodiments of this application, a water inlet pipe is provided at the lower end of the measuring box, the inlet of the water inlet pipe is connected to the outlet of the connecting pipe, and the outlet of the water inlet pipe is located below the grating plate.

[0017] In some embodiments of this application, the flow measurement device further includes a control box, with a control module housed inside the control box, and the control box is detachably connected to the inlet tank or the measuring box.

[0018] This application has the following beneficial effects:

[0019] This application's flow measurement device comprises a compartmentalized measurement chamber consisting of an inlet tank and a measuring chamber. The liquid to be measured enters the inlet tank, then flows through a connecting pipe into the measuring chamber, and finally exits through a drain pipe connected to the measuring chamber. This compartmentalized measurement chamber allows for high-precision measurement under both full and partial pipe conditions, adapting to measurement needs in both scenarios and offering broad applicability. Valve assemblies on the connecting and drain pipes control their opening and closing, as well as the flow rate within the pipes, enabling the device to adapt to both continuous and intermittent drainage measurements. Simultaneously, a second liquid detector within the measuring chamber monitors changes in the liquid level and transmits the measurement data to the control module for recording and analysis. By directly measuring the fluid volume using a volumetric method, the accuracy of small flow rate measurements is significantly improved.

[0020] Of course, any product implementing this application does not necessarily need to achieve all the advantages described above simultaneously. In addition to the purposes, features, and advantages described above, this application also has other purposes, features, and advantages. The application will be further described in detail below with reference to figures. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0022] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of this application;

[0023] Figure 2 This is a schematic diagram of the internal structure of the control box according to a preferred embodiment of this application;

[0024] Figure 3 This is a schematic diagram of the preferred embodiment of the present application, showing the water inlet tank and the measuring box arranged vertically.

[0025] Legend: 1. Water inlet tank; 11. Water inlet tank inlet; 12. Water inlet tank outlet; 13. Water inlet tank cover; 2. Measuring box; 21. Measuring box inlet pipe; 22. Measuring box outlet; 23. Measuring box cover; 3. Control box; 4. Control module; 5. First ultrasonic level gauge; 6. Second ultrasonic level gauge; 7. Connecting pipe; 71. Water inlet valve; 72. Water inlet booster pump; 8. Drain pipe; 81. Drain valve; 82. Drain booster pump; 9. Grating plate. Detailed Implementation

[0026] The embodiments of this application are described in detail below with reference to the accompanying drawings; however, this application may be implemented in a variety of different ways as defined and covered below.

[0027] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of this application; Figure 2 This is a schematic diagram of the internal structure of the control box according to a preferred embodiment of this application; Figure 3 This is a schematic diagram of the preferred embodiment of the present application, showing the water inlet tank and the measuring box arranged vertically.

[0028] A flow measurement device, characterized in that it includes an inlet tank 1, a measuring box 2, a control module 4, a connecting pipe 7, and a drain pipe 8:

[0029] The water inlet tank 1 and the measuring tank 2 are arranged side by side or one above the other. The water inlet tank 1 is provided with a water inlet 11 for water intake. The water inlet tank 1 and the measuring tank 2 are connected by a connecting pipe 7. The drain pipe 8 is connected to the measuring tank outlet 22 at the lower end of the measuring tank 2. Both the connecting pipe 7 and the drain pipe 8 are provided with valve assemblies. The valve assemblies are connected to the control module 4 and are controlled to open and close by the control module 4. The measuring tank 2 is provided with a second liquid level detector for monitoring the liquid level. The second liquid level detector is connected to the control module 4 and transmits the detected liquid level data to the control module 4.

[0030] The phrase "water inlet tank 1 and measuring tank 2 are arranged side by side or one above the other" means that water inlet tank 1 can be placed above measuring tank 2 or arranged side by side with measuring tank 2. When water inlet tank 1 is located above measuring tank 2, the liquid in water inlet tank 1 can enter measuring tank 2 through connecting pipe 7 by gravity. When water inlet tank 1 and measuring tank 2 are arranged side by side, the liquid in water inlet tank 1 can enter measuring tank 2 through connecting pipe 7 by means of a connector.

[0031] In some embodiments, the flow measurement device further includes a control box 3, with the inlet tank 1 and the measuring box 2 arranged side by side on the control box 3, and the control module 4 disposed inside the control box 3. The inlet tank 1 and the measuring box 2 arranged side by side are connected by a connecting pipe 7. Through the principle of the connector, water in the inlet tank 1 can enter the measuring box 2 through the connecting pipe 7, and the water level rises from the bottom of the measuring box 2.

[0032] Here, "control module 4" refers to the component connected to the valve assembly and the second liquid level detector. In some embodiments, control module 4 includes a PLC, a wireless transmission mechanism, and a power supply mechanism. It should be noted that control module 4 performs flow rate calculations and outputs flow rate-related data through standard interfaces such as RS485 and RS232. The upper and lower liquid level values ​​of the measuring tank 2 can be set in control module 4. Additionally, the cross-sectional area of ​​the measuring tank 2 can also be set in the control module 4; the upper and lower liquid level values ​​of the measuring tank 2, as well as the cross-sectional area S of the measuring tank 2, can be preset.

[0033] In some embodiments, the "connecting pipe 7" is arranged inside the control box 3.

[0034] This application uses a compartmentalized measuring chamber consisting of an inlet tank 1 and a measuring tank 2. The liquid to be measured enters the inlet tank 1, then flows through a connecting pipe 7 into the measuring tank 2, and finally exits through a drain pipe 8 connected to the measuring tank 2. This compartmentalized measuring chamber allows the equipment to achieve high-precision measurements under both full and partial pipe conditions, adapting to measurement needs under both conditions and offering wide applicability. Valve assemblies are installed on the connecting pipe 7 and the drain pipe 8 to control their opening and closing, as well as the flow rate of the fluid within the pipes, enabling the equipment to adapt to both continuous and intermittent drainage measurements. Simultaneously, a second liquid detector is installed inside the measuring tank 2 to monitor changes in the liquid level and transmits the liquid level measurement data to the control module 4 for recording and analysis. The fluid volume is directly measured using a volumetric method, significantly improving the accuracy of small flow rate measurements.

[0035] Preferably, please refer to Figure 1 and Figure 3 As shown, the valve assembly includes an inlet valve 71 and a drain valve 81. The inlet valve 71 is located on the connecting pipe 7 and is used to open or close the connecting pipe 7. The drain valve 81 is located on the drain pipe 8 and is used to open or close the drain pipe 8.

[0036] It is understandable that the flow path of the liquid being measured can be controlled by opening and closing the connecting pipe 7 and the drain pipe 8 through the inlet valve 71 and the drain valve 81, respectively. The liquid being measured enters the flow measuring device from the inlet 11 of the inlet tank 1. At this time, the inlet valve 71 is in the open state and the drain valve 81 is in the closed state. Then, the liquid being measured can enter the measuring tank 2 through the connecting pipe 7, and the liquid level change in the measuring tank 2 is monitored by the second liquid level detector in the measuring tank 2.

[0037] It is understandable that when the lower liquid level of measuring tank 2 is set to be greater than 0, the outlet of measuring tank 2 is located at or below the lower liquid level of measuring tank 2. When the lower liquid level of measuring tank 2 is set to be equal to 0, the outlet of measuring tank 2 is located at the bottom or side bottom of measuring tank 2. This setting ensures accurate measurement of the flow rate.

[0038] In some embodiments, a first liquid level detector is provided in the water inlet tank 1. By monitoring the fluctuation of the liquid level in the water inlet tank 1 through the first liquid level detector, the liquid level value of the water inlet tank 1 can be measured during the water inlet process.

[0039] Optionally, both the inlet valve 71 and the drain valve 81 are electric ball valves, which facilitates procurement, maintenance and replacement.

[0040] Preferably, please refer to Figure 1 and 2As shown, the valve assembly also includes an inlet booster pump 72 and a drain booster pump 82. The inlet booster pump 72 is located on the connecting pipe 7 and is used to accelerate the flow rate of the fluid in the connecting pipe 7. The drain booster pump 82 is located on the drain pipe 8 and is used to accelerate the drainage flow rate of the drain pipe 8.

[0041] Understandably, the inlet booster pump 72 and the outlet booster pump 82 can respectively accelerate the flow rate of the connecting pipe 7 and the outlet pipe 8 to handle continuous and intermittent drainage measurements. When the connecting pipe 7 is in the connected state and in the water inlet process, measuring the liquid level values ​​of the inlet tank 1 and the measuring tank 2, if the liquid level value in the inlet tank 1 is greater than or equal to the upper liquid level line setting value of the inlet tank 1, the inlet booster pump 72 is started to accelerate the flow rate; if the liquid level value in the inlet tank 1 is less than or equal to the lower liquid level line setting value of the inlet tank, the inlet booster pump is turned off. 72. No need to increase the flow rate; when performing the drainage process and measuring the liquid level of measuring tank 2, open the drain valve 81 and the drain booster pump 82 to start draining the measuring tank 2. When the second liquid level detector detects that the liquid level of measuring tank 2 has dropped to the lower liquid level line set value of measuring tank 2, the control module 4 controls the drain valve 81 and the drain booster pump 82 to close, and then detects the liquid level of measuring tank 2 again. Measure the liquid level multiple times and take the average value as the lower liquid level value. This operation can obtain a more accurate lower liquid level value.

[0042] Preferably, the flow measurement device further includes a first liquid level detector installed in the water inlet tank 1 for monitoring the liquid level. The first liquid level detector is connected to the control module 4 and transmits the detected liquid level data to the control module 4.

[0043] In a preferred embodiment, please refer to Figure 1 As shown, the first liquid level detector includes a first ultrasonic level gauge 5, which is installed on the top of the water inlet tank 1; the second liquid level detector includes a second ultrasonic level gauge 6, which is installed on the top of the measuring tank 2.

[0044] It is understandable that by installing a first ultrasonic level gauge 5 and a second ultrasonic level gauge 6 on the top of the water inlet tank 1 and the measuring tank 2 respectively, the changes in the liquid level in the water inlet tank 1 and the measuring tank 2 can be monitored in real time and accurately, and the monitored values ​​can be transmitted to the control module 4 for recording and analysis in a timely manner.

[0045] In this preferred embodiment, the water inlet tank 1 and the measuring tank 2 are arranged side by side. The top of the water inlet tank 1 is provided with a detachable water inlet tank cover 13, and the first ultrasonic level gauge 5 is provided on the bottom surface of the water inlet tank cover 13. The top of the measuring tank 2 is provided with a detachable measuring tank cover 23, and the second ultrasonic level gauge 6 is provided on the bottom surface of the measuring tank cover 23.

[0046] It is understandable that the first ultrasonic level gauge 5 and the second ultrasonic level gauge 6 can be respectively installed on the bottom surface of the water inlet tank cover 13 and the bottom surface of the measuring tank cover 23, which facilitates the installation, maintenance and replacement of the first ultrasonic level gauge 5 and the second ultrasonic level gauge 6.

[0047] It should be noted that both the water inlet tank cover 13 and the measuring tank cover 23 are provided with wiring holes to facilitate the arrangement of the power supply and signal lines of the liquid level detector.

[0048] Preferably, both the water inlet tank cover 13 and the measuring tank cover 23 are provided with air guide holes. The air guide holes are used to promote air flow in the water inlet tank 1 and the measuring tank 2 to balance the air pressure in the water inlet tank 1 and the measuring tank 2.

[0049] It is understandable that by opening air vents on the water inlet cover 13 and the measuring box cover 23, the air flow inside the water inlet 1 and the measuring box 2 can be facilitated to cope with the air pressure changes inside the water inlet 1 and the measuring box 2 caused by the rise and fall of the liquid being measured, which is conducive to achieving more accurate and stable measurements.

[0050] It is understood that in this preferred embodiment, the liquid in the inlet tank 1 enters the measuring tank 2 through the connecting pipe 7. When the second ultrasonic level gauge 6 detects that the liquid level in the measuring tank 2 has risen to the preset value of the upper liquid level line, the inlet valve 71 is closed, and then the liquid level in the measuring tank 2 is detected again. The liquid level is measured multiple times and the average value is taken as the upper liquid level value, which can improve the detection accuracy. Then the drain valve 81 is opened to drain the water.

[0051] Preferably, please refer to Figure 1 and Figure 3 As shown, the flow measurement device also includes a grid plate 9, which is disposed at the lower part of the measuring chamber 2. The grid plate 9 is used to break up air bubbles in the liquid inside the measuring chamber 2 to promote the rise of air bubbles.

[0052] In this preferred embodiment, please refer to Figure 2 As shown, a water inlet pipe 21 is provided at the lower end of the measuring box 2. The inlet of the water inlet pipe 21 is connected to the outlet of the connecting pipe 7, and the outlet of the water inlet pipe 21 is located below the grating plate 9.

[0053] It is understandable that when the liquid to be measured in the inlet tank 1 enters the measuring tank 2 through the connecting pipe 7, it first enters the measuring tank 2 through the measuring tank inlet pipe 21 at the lower end of the measuring tank 2. As the liquid level continues to rise, the liquid will overflow the grid plate 9. The grid plate 9 can disperse the air bubbles in the liquid, especially large air bubbles, promote the rise and escape of air bubbles, reduce air bubble interference, and help improve the accuracy of flow measurement.

[0054] Preferably, when the water inlet tank 1 and the measuring box 2 are arranged side by side, the water inlet tank 1 and the measuring box 2 are designed as a single unit, which facilitates the transportation, maintenance and assembly of the two as a whole measuring module.

[0055] Preferably, the flow measurement device further includes a control box 3, and the control module 4 is located inside the control box 3. The control box 3 is detachably connected to the water inlet tank 1 or the measuring box 2.

[0056] It is understandable that the inlet tank 1 and the measuring tank 2 can be designed as a single integrated unit, with the control box 3 being detachable. This facilitates the overall transportation, maintenance, and assembly of the flow measurement device with a compartmentalized measuring chamber structure. Specifically, the inlet tank 1 and the measuring tank 2 are arranged side by side, with their opposing side walls connected to each other. Alternatively, the inlet tank 1 and the measuring tank 2 can be formed by separating the integrated housing with a partition.

[0057] In some embodiments, a limiting baffle is provided on the top of the control box 3, and the limiting baffle forms a limiting cavity. The integrally formed water inlet tank 1 and measuring box 2 are placed in the limiting cavity and limited by the limiting baffle. Then, bolts can be screwed into the preset screw holes on the limiting baffle and pressed against the side walls of the water inlet tank 1 and measuring box 2 to strengthen the limiting of the water inlet tank 1 and measuring box 2.

[0058] It should be noted that when the water inlet tank 1 is located above the measuring box 2, the control box 3 is located below the measuring box 2. The detachable design of the measuring box 2 and the control box 3 facilitates the transportation and maintenance of each box.

[0059] Example 1

[0060] The inlet tank 1 and the measuring tank 2 are arranged side by side. When the flow measurement device of this application is used, the measurement process is divided into four steps: inlet flow and measurement of the liquid level values ​​of inlet tank 1 and measuring tank 2; drainage flow and measurement of the liquid level value of measuring tank 2; flow calculation; and data output. In some embodiments, the valve assembly includes an inlet valve 71 and an inlet booster pump 72 installed on the connecting pipe 7, and a drain valve 81 and a drain booster pump 82 installed on the drain pipe 8. The specific working principle is as follows:

[0061] 1. Measuring the liquid level values ​​of inlet tank 1 and measuring tank 2 during the water intake process: The liquid to be measured enters inlet tank 1 from inlet tank 11. At this time, inlet valve 71 is in the open state, inlet booster pump 72 is in the off state, drain valve 81 is in the closed state, and drain booster pump 82 is in the off state.

[0062] After the liquid to be tested enters the water inlet tank 1, it flows through the bottom water inlet tank outlet 12, and then through the water inlet valve 71, the water inlet booster pump 72, and the inlet of the measuring tank 2 into the measuring tank 2. The first ultrasonic level gauge 5 detects the liquid level in the water inlet tank 1 in real time. If the liquid level in the water inlet tank 1 is greater than or equal to the upper liquid level line setting value of the water inlet tank 1, the water inlet booster pump 72 is started to accelerate the flow rate. If the liquid level in the water inlet tank 1 is less than or equal to the lower liquid level line setting value of the water inlet tank 1, the water inlet booster pump 72 is turned off to stop accelerating the flow rate. At the same time, this process continues, and the liquid level in the measuring tank 2 will slowly rise and pass through the grid plate 9. The grid plate 9 can break up large air bubbles, promote the rise and escape of air bubbles, and reduce air bubble interference.

[0063] When the second ultrasonic level gauge 6 detects that the liquid level in the measuring tank 2 has risen to the upper liquid level line setting value, or when the liquid level in the measuring tank 2 remains at a certain liquid level value between the upper and lower liquid level line setting values ​​that is greater than or equal to the normal drainage time T (which can be set in the control module 4) (indicating that the drainage is intermittent), the control and flow calculation module controls and closes the inlet valve 71 and the inlet booster pump 72 (if they are in the open state), and then detects the liquid level in the measuring tank 2 again. The liquid level is measured multiple times continuously, and the average value L1 is taken as the upper liquid level value to improve the detection accuracy. Then the drainage flow rate is entered and the lower liquid level value is measured.

[0064] 2. Measuring the liquid level of measuring tank 2 during the drainage process: Control and open the drain valve 81 and the drain booster pump 82 to start draining the measuring tank 2. When the second ultrasonic level gauge 6 detects that the liquid level of the measuring tank 2 has dropped to the lower liquid level line set value, the calculation control module 4 controls and closes the drain valve 81 and the drain booster pump 82, and then detects the liquid level of the measuring tank 2 again. The liquid level is measured multiple times and the average value L2 is taken as the lower liquid level value. Then the calculation control module 4 performs flow calculation.

[0065] 3. Flow calculation

[0066] The flow rate measured each time is Qi = (L1 - L2) * S, and the cumulative flow rate is...

[0067] The time period flow is Qt = Qn - Qm; Qn is the cumulative flow after the current period, and Qm is the cumulative flow before the current period.

[0068] Flow velocity V = Qt / t; t is the time interval.

[0069] 4. Data Output

[0070] The system continuously measures and outputs the data to the terminal device via the calculation and control module 4.

[0071] Example 2

[0072] The inlet tank 1 is positioned above the measuring tank 2. When using the flow measurement device of this application, the upper and lower liquid level lines within the measuring tank 2 can be set in the control module 4. Additionally, the cross-sectional area of ​​the measuring tank can also be set in the control module 4. The upper liquid level line value L1, the lower liquid level line value L2, and the cross-sectional area S of the measuring tank are set during factory testing and used as default values.

[0073] Based on the site conditions, the liquid to be tested is selected to be connected to the online flow monitoring device through the inlet 11 of the inlet tank 1 (including at least one of the side wall inlet and the top inlet). The inlet valve 71 is in the open state at this time, and the drain valve 81 is in the closed state. After the water to be tested enters the inlet tank 1, it enters the inlet tank outlet 12 along the bottom guide surface, and then enters the measuring tank 2 through the inlet valve 71 and the measuring tank inlet pipe 21. Continuing this process, the liquid level in the measuring tank 2 will slowly rise and pass through the grid plate 9. The grid plate 9 can break up large air bubbles, promote the rise and escape of air bubbles, and reduce air bubble interference.

[0074] When the second ultrasonic level gauge 6 detects that the liquid level in the measuring tank 2 has risen to the upper liquid level line setting value, the control module 4 controls and closes the inlet valve 71. Then, it repeatedly detects the liquid level in the measuring tank 2 and takes the average value L1 as the upper liquid level value L1 of the measuring tank to improve detection accuracy. Then, it controls and opens the drain valve 81 to start draining the measuring tank 2. When the second ultrasonic level gauge 6 detects that the liquid level in the measuring tank 2 has dropped to the lower liquid level line setting value, the control module 4 controls and closes the drain valve 81. Then, it repeatedly detects the liquid level in the measuring tank 2 and takes the average value L2 as the lower liquid level value of the measuring tank, and then performs flow calculation.

[0075] The flow rate measured each time is Qi = (L1 - L2) * S, and the cumulative flow rate is...

[0076] The time period flow is Qt = Qn - Qm; Qn is the cumulative flow after the current period, and Qm is the cumulative flow before the current period.

[0077] Flow velocity V = Qt / t; t is the time interval.

[0078] The system continuously measures and outputs the data to the terminal device via the control module 8.

[0079] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0080] This document uses specific examples to illustrate the principles and implementation methods of this application. The examples are merely for the purpose of helping to understand the method and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, and the existence of an infinite number of specific structures, those skilled in the art can make various improvements, modifications, or variations without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, variations, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered as protected by this application.

Claims

1. A flow measuring device, characterized by, Includes an inlet tank (1), a measuring box (2), a control module (4), a connecting pipe (7), and a drain pipe (8): The water inlet tank (1) and the measuring tank (2) are arranged side by side or one above the other. The water inlet tank (1) is provided with a water inlet (11) for water intake. The water inlet tank (1) and the measuring tank (2) are connected by a connecting pipe (7). The drain pipe (8) is connected to the measuring tank outlet (22) at the lower end of the measuring tank (2). Both the connecting pipe (7) and the drain pipe (8) are provided with valve assemblies. The valve assemblies are connected to the control module (4) and are controlled to open and close by the control module (4). The measuring tank (2) is provided with a second liquid level detector for monitoring the liquid level. The second liquid level detector is connected to the control module (4) and transmits the detected liquid level data to the control module (4).

2. A flow measuring device according to claim 1, characterised in that The valve assembly includes an inlet valve (71) and a drain valve (81). The inlet valve (71) is located on the connecting pipe (7) and is used to open or close the connecting pipe (7). The drain valve (81) is located on the drain pipe (8) and is used to open or close the drain pipe (8).

3. A flow measuring device according to claim 2, wherein, The valve assembly also includes an inlet booster pump (72) and a drain booster pump (82). The inlet booster pump (72) is located on the connecting pipe (7) and is used to increase the flow rate of the fluid in the connecting pipe (7). The drain booster pump (82) is located on the drain pipe (8) and is used to increase the drainage flow rate of the drain pipe (8).

4. The flow measuring device of claim 1, wherein, It also includes a first liquid level detector installed in the water inlet tank (1) for monitoring the liquid level. The first liquid level detector is connected to the control module (4) and transmits the detected liquid level data to the control module (4).

5. A flow measuring device according to claim 4, wherein, The first liquid level detector includes a first ultrasonic level gauge (5), which is located on the top of the water inlet tank (1); the second liquid level detector includes a second ultrasonic level gauge (6), which is located on the top of the measuring tank (2).

6. A flow measuring device according to claim 5, wherein, The water inlet tank (1) and the measuring tank (2) are arranged side by side. The top of the water inlet tank (1) is provided with a detachable water inlet tank cover (13), and the first ultrasonic level gauge (5) is located on the bottom surface of the water inlet tank cover (13). The top of the measuring tank (2) is provided with a detachable measuring tank cover (23), and the second ultrasonic level gauge (6) is located on the bottom surface of the measuring tank cover (23).

7. A flow measuring device according to claim 6, wherein Both the water inlet tank cover (13) and the measuring tank cover (23) are provided with air vents. The air vents are used to promote air flow in the water inlet tank (1) and the measuring tank (2) to balance the air pressure in the water inlet tank (1) and the measuring tank (2).

8. The flow measuring device of claim 1, wherein, The flow measurement device also includes a grid plate (9), which is located at the bottom of the measuring chamber (2). The grid plate (9) is used to break up air bubbles in the liquid inside the measuring chamber (2) to promote the rise of air bubbles.

9. A flow measuring device according to claim 8, wherein, The lower end of the measuring box (2) is provided with a measuring box water inlet pipe (21). The inlet of the measuring box water inlet pipe (21) is connected to the outlet of the connecting pipe (7). The outlet of the measuring box water inlet pipe (21) is located below the grid plate (9).

10. The flow measuring device of claim 1, wherein, The flow measurement device also includes a control box (3), and the control module (4) is located inside the control box (3). The control box (3) is detachably connected to the inlet tank (1) or the measuring box (2).

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