Volumetric method flow measuring device and underground drainage system

Abstract

The utility model discloses a volumetric method flow measuring device and an underground drainage system, and the volumetric method flow measuring device comprises a water tank, a valve mechanism and a measuring mechanism, the water tank is vertically divided into a water collecting cavity and a measuring cavity, a water inlet is formed in the upper portion of the water collecting cavity, a water diversion hole is formed between the water collecting cavity and the measuring cavity, and a drainage hole is formed in the bottom end of the measuring cavity. The valve mechanism opens the drainage hole when blocking the water diversion hole and blocks the drainage hole when opening the water diversion hole; the measuring mechanism comprises a first liquid level sensing assembly, a second liquid level sensing assembly and a timing assembly, the first liquid level sensing assembly is used for driving the valve mechanism to open the water diversion hole when the measuring cavity is empty, and the second liquid level sensing assembly is used for driving the valve mechanism to block the water diversion hole when the liquid level in the water tank reaches a preset height; the timing assembly is used for counting the duration when the liquid level in the water tank reaches the preset height. The volume method flow measurement device can be suitable for flow measurement in different application scenes, and missing detection gaps are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of flow measurement, and in particular to a volumetric flow measurement device and an underground drainage system using the volumetric flow measurement device. Background Art

[0002] At present, conventional flow monitoring devices require a large amount of maintenance and need to be calibrated regularly to ensure the correctness of detection data. In addition, there are specific requirements for the flow test environment, otherwise it is difficult to ensure the accuracy of test results. For example, electromagnetic flowmeters need to be metered as much as possible in a full-pipe state, and the pipeline interior needs to be relatively clean and free of blockages. Flow monitoring devices such as ultrasonic Doppler flowmeters and radar flowmeters generally need to measure the point velocity or line velocity of the fluid inside the pipeline first, and then obtain the overall pipeline flow through an internal algorithm. During this process, the flow monitoring value may be distorted, and in small-flow scenarios, such as when the water is shallow and the flow velocity is slow, it is very likely to exceed its flow detection lower limit. In municipal drainage pipe networks, especially rainwater pipe networks, the rain and sewage in the pipelines often show a state of small flow, low velocity, and intermittent flow during the low peak period (or dry days). It is usually difficult to measure the flow of such fluids through existing flow measurement devices.

[0003] In this regard, Chinese invention patent CN113551723A provides a fully automatic measurement device, which sets at least two float level gauges between the horizontal heights corresponding to the drainage trigger point and the stop drainage point in the water collection box, and calculates the flow according to the relationship between the time and volume consumed by the liquid level from one float to another, and can adapt to the measurement operation of larger flows by adjusting the size of the water collection box. However, this fully automatic measurement device can only measure during the water inlet process of the water collection box and cannot measure during the drainage process of the water collection box, resulting in missing inspection gaps in the flow measurement operation and being unable to perform continuous measurement of the water flow in different time periods, that is, it is difficult to measure the drainage in all time periods. Summary of the Utility Model

[0004] The primary object of the present utility model is to provide a volumetric flow measurement device to solve the technical problems that existing flow measurement devices cannot perform flow measurement for different application scenarios and cannot perform continuous and accurate flow measurement operations.

[0005] The present utility model also provides an underground drainage system using the above volumetric flow measurement device.

[0006] According to the first aspect of the present utility model, there is provided a volumetric flow measurement device, including a water tank, a valve mechanism, and a measurement mechanism;

[0007] The inner cavity of the water tank is vertically partitioned into a water collection cavity and a measurement cavity located below the water collection cavity. An inlet hole is provided at the upper part of the water collection cavity. A water diversion hole is provided between the water collection cavity and the measurement cavity. A drain hole is provided at the bottom end of the measurement cavity. The apertures of the water diversion hole and the drain hole are both larger than the aperture of the inlet hole;

[0008] The valve mechanism includes a driving assembly, a first valve plate and a second valve plate respectively connected to the driving assembly. The driving assembly includes a first driving state and a second driving state. The first driving state of the driving assembly is to drive the first valve plate to block the water diversion hole and at the same time drive the second valve plate to open the drain hole. The second driving state of the driving assembly is to drive the first valve plate to open the water diversion hole and at the same time drive the second valve plate to block the drain hole;

[0009] The measuring mechanism includes a first liquid level sensing assembly, a second liquid level sensing assembly and a timing assembly. The first liquid level sensing assembly is arranged at the bottom of the measurement cavity and is used to send a signal to drive the driving assembly to switch to the second driving state when the measurement cavity is empty. The second liquid level sensing assembly is arranged at a position higher than the first liquid level sensing assembly in the measurement cavity or at a position lower than the inlet hole in the water collection cavity. The second liquid level sensing assembly is used to send a signal to drive the driving assembly to switch to the first driving state when the liquid level in the water tank reaches a preset height. The timing assembly is used to count the duration when the liquid level in the water tank reaches the preset height.

[0010] Preferably, the volumetric flow measurement device further includes an exhaust passage. The first end of the exhaust passage is communicated with the measurement cavity. The second end of the exhaust passage is arranged at a position higher than the inlet hole and is used to communicate with the external environment.

[0011] Preferably, the volumetric flow measurement device further includes a periodic timing assembly for adjusting the duration of the detection period. The periodic timing assembly is used to send a signal to drive the driving assembly to switch to the first driving state when the liquid level in the water tank cannot reach the preset height within the preset detection period duration.

[0012] Preferably, the valve mechanism further includes a transmission rod. The driving assembly is connected to the transmission rod and is used to drive the transmission rod to move along its axial direction. The water diversion hole and the drain hole are both coaxially arranged relative to the transmission rod. The first valve plate is connected to the transmission rod and is arranged at one end of the water diversion hole facing the measurement cavity. The second valve plate is connected to the transmission rod and is arranged at one end of the drain hole facing the measurement cavity.

[0013] Preferably, one end of the first valve plate facing the water diversion hole is provided with a first conical structure whose diameter gradually expands in a direction away from the water diversion hole, and one end of the second valve plate facing the drain hole is provided with a second conical structure whose diameter gradually expands in a direction away from the drain hole.

[0014] Preferably, one end of the second valve plate away from the drain hole is provided with a third conical structure whose diameter gradually shrinks in a direction away from the drain hole.

[0015] Preferably, flexible rubber sleeves are sleeved on the outer peripheries of the first valve plate and the second valve plate.

[0016] Preferably, the water inlet hole is arranged on the side wall of the upper part of the water collecting cavity;

[0017] The volumetric flow measurement device further includes a third liquid level sensing component and an alarm module. The third liquid level sensing component is arranged above the water inlet hole, and the alarm module is electrically connected to the third liquid level sensing component and is used to emit an alarm signal when the third liquid level sensing component detects a liquid level signal.

[0018] Preferably, an overflow hole communicating with the water collecting cavity is further opened at the top end of the water tank.

[0019] Preferably, the water tank further includes a partition plate and a bottom plate. The partition plate is arranged between the water collecting cavity and the measurement cavity and is provided with the water diversion hole. The bottom plate is arranged at the bottom end of the measurement cavity and is provided with the drain hole. The top surface of the partition plate is inclined downward towards the water diversion hole, and the top surface of the bottom plate is inclined downward towards the drain hole.

[0020] Preferably, a plurality of legs are arranged at the bottom of the water tank. The plurality of legs are arranged around the drain hole and are used to jointly support the water tank.

[0021] According to the second aspect of the present invention, there is also provided an underground drainage system, including the above-mentioned volumetric flow measurement device.

[0022] The present invention has the following beneficial effects:

[0023] In the volumetric flow measurement device provided by the present utility model, the water inlet hole remains in a conducting state. Before the start of a new detection cycle, the drain hole is opened first to empty the liquid in the measurement chamber, and then the driving assembly is switched to the second driving state. At this time, the drain hole is closed and the water diversion hole is conducting. By counting the time taken for the liquid level in the water tank to reach the preset height through the timing component, the flow rate can be accurately calculated in combination with the volume of the water tank corresponding to the preset height. The structure is simple and efficient, with low cost and high measurement accuracy. It is applicable to large / small flow measurement operations, has a wide applicability, and when the drain hole is opened to drain the liquid in the measurement chamber after the detection is completed, the water diversion hole is in a closed state. At this time, the liquid entering along the water inlet hole can continue to be collected through the water collection chamber, avoiding the situation where some liquid is directly discharged without measuring the flow rate, thereby avoiding the occurrence of undetected gaps and enabling the flow measurement of all liquids, realizing full-time flow measurement and providing more comprehensive and accurate flow data.

[0024] In addition to the objectives, features, and advantages described above, the present utility model has other objectives, features, and advantages. The following will refer to the drawings for a further detailed description of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0026] Figure 1 is a schematic structural diagram of the volumetric flow measurement device provided by an embodiment of the present utility model;

[0027] Figure 2 is Figure 1 an axial sectional view of an embodiment of the volumetric flow measurement device shown;

[0028] Figure 3 is Figure 1 an axial sectional view of another embodiment of the volumetric flow measurement device shown;

[0029] LEGEND DESCRIPTION:

[0030] 1000, volumetric flow measurement device; 1, water tank; 11, water collection chamber; 12, measurement chamber; 13, water inlet hole; 14, water diversion hole; 15, drain hole; 16, partition board; 17, bottom plate; 2, valve mechanism; 21, driving assembly; 22, first valve plate; 221, first conical structure; 23, second valve plate; 231, second conical structure; 232, third conical structure; 24, transmission rod; 3, measurement mechanism; 31, first liquid level sensing component; 32, second liquid level sensing component; 4, third liquid level sensing component; 5, alarm module; 6, support leg. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. However, the present utility model can be implemented in many different ways defined and covered by the following.

[0032] Please combine Figure 1 and Figure 2 , an embodiment of the present utility model provides a volumetric flow measurement device 1000, including a water tank 1, a valve mechanism 2 and a measurement mechanism 3. The inner cavity of the water tank 1 is vertically divided into a water collection cavity 11 and a measurement cavity 12. The measurement cavity 12 is located below the water collection cavity 11. An inlet hole 13 is opened in the upper part of the water collection cavity 11. A diversion hole 14 is provided between the water collection cavity 11 and the measurement cavity 12. A drain hole 15 is provided at the bottom end of the measurement cavity 12. The apertures of the diversion hole 14 and the drain hole 15 are both larger than the aperture of the inlet hole 13, so that the drainage speed of the diversion hole 14 and the drain hole 15 is greater than the water inlet speed of the inlet hole 13.

[0033] Further, the valve mechanism 2 includes a driving component 21, and a first valve plate 22 and a second valve plate 23 respectively connected to the driving component 21. The first valve plate 22 is arranged at one end of the diversion hole 14 and is adapted to the diversion hole 14. The second valve plate 23 is arranged at one end of the drain hole 15 and is adapted to the drain hole 15. The driving component 21 includes a first driving state and a second driving state. The first driving state of the driving component 21 is to drive the first valve plate 22 to block the diversion hole 14 and at the same time drive the second valve plate 23 to open the drain hole 15. The second driving state of the driving component 21 is to drive the first valve plate 22 to open the diversion hole 14 and at the same time drive the second valve plate 23 to block the drain hole 15.

[0034] Further, the measurement mechanism 3 includes a first liquid level sensing component 31, a second liquid level sensing component 32 and a timing component (not shown in the figure, the same below). The first liquid level sensing component 31 is arranged at the bottom of the measurement cavity 12 and is used to send a signal to drive the driving component 21 to switch to the second driving state when the measurement cavity 12 is empty (that is, there is no liquid in the measurement cavity 12). The second liquid level sensing component 32 is arranged at a position higher than the first liquid level sensing component 31 in the measurement cavity 12 or at a position lower than the inlet hole 13 in the water collection cavity 11. The second liquid level sensing component 32 is used to Send a signal to drive the driving component 21 to switch to the first driving state, and the timing component is used to count the liquid level in the water tank 1 reaching State, the timing component is used to count the liquid level in the water tank 1 reaching reach the preset height. The timing component is used to record the time duration from when the liquid level in the water tank 1 reaches the preset height to when the liquid level in the measurement cavity 12 drops to the lowest point. Since the water collection cavity 11 has started to collect the liquid for the next detection cycle while the drain hole 15 is opened for drainage, the timing component can specifically start timing for the next detection cycle at the end of the timing.

[0035] It should be understood that the preset height is the installation height of the second liquid level sensing component 32 in the water tank 1. Since the volume of the water tank 1 remains unchanged, when the liquid level in the water tank 1 reaches the preset height, the volume of the liquid in the water tank 1 at this time can be obtained.

[0036] Specifically, in the volumetric flow measurement device 1000, the water inlet hole 13 remains in a conducting state. Starting from the moment when the driving component 21 switches to the second driving state and enters a new detection cycle, at this time the drain hole 15 is closed and the water diversion hole 14 is conducting. By using the timing component to count the duration when the liquid level in the water tank 1 reaches the preset height, the flow rate can be accurately calculated in combination with the volume of the water tank 1 corresponding to the preset height. The structure is simple and efficient, with low cost and high measurement accuracy, and it is applicable to large / small flow measurement operations, having a wide applicability. Moreover, when the drain hole 15 is opened to drain the liquid in the measurement chamber 12 at the end of this detection cycle, the water diversion hole 14 is in a closed state. At this time, the liquid entering along the water inlet hole 13 can continue to be collected through the water collection chamber 11, avoiding the situation that some liquid is directly drained without measuring the flow rate, thus avoiding the occurrence of undetected gaps and enabling the flow measurement of all liquids, realizing full-time flow measurement and providing more comprehensive and accurate flow data. Secondly, when the measurement chamber 12 is empty (i.e., there is no liquid), the first liquid level sensing component 31 emits a signal to drive the driving component 21 to switch to the second driving state, conduct the water diversion hole 14 and simultaneously close the drain hole 15, so that the liquid in the water collection chamber 11 enters the measurement chamber 12 through the water diversion hole 14. When the liquid level in the water tank 1 reaches the preset height, it is a timing cycle for flow measurement.

[0037] Such as Figure 2As shown, in one embodiment, the second liquid level sensing component 32 is disposed at a position higher than the first liquid level sensing component 31 within the measurement chamber 12. The initial measurement period starts timing when the first liquid level sensing component 31 senses the entry of liquid. At this time, the driving component 21 is in the second driving state, and the liquid entering through the water inlet hole 13 can directly enter the measurement chamber 12 until the liquid in the measurement chamber 12 reaches the detection position of the second liquid level sensing component 32, at which point the timing ends and the initial detection period is completed. The subsequent measurement period starts timing when the drain hole 15 is opened for drainage. At this time, the liquid entering through the water inlet hole 13 can be collected by the water collection chamber 11. After the liquid in the measurement chamber 12 is emptied, the driving component 21 switches to the second driving state. At this time, the drain hole 15 closes and the water diversion hole 14 conducts. The liquid in the water collection chamber 11 can then enter the measurement chamber 12 along the water diversion hole 14 until the liquid in the water collection chamber 11 is emptied and the liquid in the measurement chamber 12 reaches the installation height of the second liquid level sensing component 32, at which point the timing ends and one detection period is completed. The flow rate Q of a single detection period is Q = V / t, where V is the volume of the measurement chamber 12 corresponding to the installation height of the second liquid level sensing component 32, and t is the duration of this detection period. The flow rate Q of N detection periods is Q = NV / (t1 + … + t N ).

[0038] As Figure 3As shown, in another embodiment, the second liquid level sensing component 32 is disposed in the water collecting chamber 11 at a position lower than the water inlet hole 13, that is, when the liquid fills the measuring chamber 12 and overflows into the water collecting chamber 11 to reach a preset height, it is a detection cycle. Similarly, the initial measurement cycle starts from when the first liquid level sensing component 31 senses that liquid has entered. At this time, the driving component 21 is in the second driving state, and the liquid entering through the water inlet hole 13 can directly enter the measuring chamber 12 until the liquid fills the measuring chamber 12 and overflows into the water collecting chamber 11 to reach the detection position of the second liquid level sensing component 32, and the initial detection cycle is completed; and the subsequent measurement cycle starts from when the drain hole 15 is opened for drainage. At this time, the water collecting chamber 11 has the remaining liquid from the previous detection cycle, and the volume of the remaining liquid is fixed. At this time, the liquid entering through the water inlet hole 13 can also be detected by the collecting chamber. The water chamber 11 collects the liquid. When the liquid in the measuring chamber 12 is emptied, the driving component 21 switches to the second driving state. At this time, the drainage hole 15 is closed, and the water diversion hole 14 is turned on. The liquid in the water collection chamber 11 can enter the measuring chamber 12 along the water diversion hole 14 until the liquid fills the measuring chamber 12 and overflows into the water collection chamber 11 to reach the installation height of the second liquid level sensing component 32. The timing ends and a detection cycle is completed. The flow rate Q of the initial detection cycle is (V+V') / t, where V is the volume of the measuring chamber 12, V' is the volume of the water collection chamber corresponding to the installation height of the second liquid level sensing component 32, and t is the duration of the detection cycle. The flow rate Q of N detection cycles is (NV+V') / (t1+…+t N ).

[0039] Preferably, the volumetric flow measurement device 1000 also includes an exhaust channel (not shown in the figure, the same below), a first end of the exhaust channel is connected to the measuring chamber 12, and a second end of the exhaust channel is arranged at a position higher than the water inlet hole 13 and is used to communicate with the external environment, so that the gas in the water collecting chamber 11 and / or the measuring chamber 12 can be drained through the exhaust channel during the process of water intake into the water collecting chamber 11 and / or the measuring chamber 12, and air can be introduced into the water collecting chamber 11 and / or the measuring chamber 12 through the exhaust channel during the process of water draining from the water collecting chamber 11 and / or the measuring chamber 12, thereby ensuring that the water intake and drainage of the water collecting chamber 11 and / or the measuring chamber 12 are smooth, avoiding the generation of negative pressure, and thus ensuring the detection accuracy.

[0040] Preferably, the volumetric flow measurement device 1000 further includes a periodic timing component (not shown in the figure, the same hereinafter) for adjusting the duration of the detection period. The periodic timing component is configured to send a signal to drive the driving component 21 to switch to the first driving state when the liquid level in the water tank 1 fails to reach the preset height within the preset detection period duration. By presetting the detection period duration through the periodic timing component, for the state of intermittent flow, when the liquid does not reach the detection position of the second liquid level sensing component 32 within the detection period duration, that is, the detection condition is not met, the driving component 21 can be driven to switch to the first driving state to drain the liquid in this detection period without measurement, avoiding excessive accumulation time of the liquid, preparing for the next detection period, and avoiding the problem that the time of this detection period is too long to accurately measure the flow rates at different time periods.

[0041] Further, in other embodiments, a pressure water level sensor (not shown in the figure, the same hereinafter) can also be provided in the water tank 1. When the liquid does not reach the detection position of the second liquid level sensing component 32 within the detection period duration, the volume of the liquid is detected by the pressure water level sensor to obtain the flow rate of this detection period.

[0042] As Figure 2 and Figure 3 shown, the valve mechanism 2 further includes a transmission rod 24. The driving component 21 is connected to the transmission rod 24 and is configured to drive the transmission rod 24 to move axially along it. Both the water inlet hole 14 and the drain hole 15 are coaxially arranged relative to the transmission rod 24. The first valve plate 22 is connected to the transmission rod 24 and is disposed at one end of the water inlet hole 14 facing the measurement chamber 12. The second valve plate 23 is connected to the transmission rod 24 and is disposed at one end of the drain hole 15 facing the measurement chamber 12. That is, both the first valve plate 22 and the second valve plate 23 are disposed in the measurement chamber 12. When the transmission rod 24 drives the first valve plate 22 to move in the direction towards the water inlet hole 14, the second valve plate 23 can be synchronously driven to move in the direction away from the drain hole 15; when the transmission rod 24 drives the first valve plate 22 to move in the direction away from the water inlet hole 14, the second valve plate 23 can also be synchronously driven to move in the direction towards the drain hole 15. By driving the transmission rod 24 to move axially along it through the driving component 21, the first valve plate 22 and the second valve plate 23 can be simultaneously driven to perform opening and closing actions and the opening and closing directions of the first valve plate 22 and the second valve plate 23 are opposite, meeting the measurement requirements, and the driving structure is simple and efficient.

[0043] Further, the driving assembly 21 can directly adopt a linear motor, a pneumatic rod or a hydraulic cylinder, or can be composed of a rotary motor and a screw bolt assembly. The rotary drive of the rotary motor is converted into a linear drive through the screw bolt assembly, and both can drive the transmission rod 24 to move along its axial direction, thereby synchronously driving the first valve plate 22 and the second valve plate 23 to perform opening and closing actions.

[0044] Preferably, one end of the first valve plate 22 facing the water inlet hole 14 is provided with a first conical structure 221 whose diameter gradually expands in the direction away from the water inlet hole 14, and one end of the second valve plate 23 facing the drain hole 15 is provided with a second conical structure 231 whose diameter gradually expands in the direction away from the drain hole 15. The first valve plate 22 is guided and inserted into the water inlet hole 14 through the first conical structure 221 and seals the water inlet hole 14, which can center the first valve plate 22 relative to the water inlet hole 14, make the first valve plate 22 fully abut against the edge of the water inlet hole 14, and improve the sealing effect of the water inlet hole 14. Similarly, the second valve plate 23 is guided and inserted into the drain hole 15 through the second conical structure 231 and seals the drain hole 15, which can center the second valve plate 23 relative to the drain hole 15, make the second valve plate 23 fully abut against the edge of the drain hole 15, and improve the sealing effect of the drain hole 15.

[0045] More preferably, one end of the second valve plate 23 away from the drain hole 15 is provided with a third conical structure 232 whose diameter gradually decreases in the direction away from the drain hole 15. Through the third conical structure 232, the garbage on the second valve plate 23 can be guided to slide down, avoiding the garbage from hanging on the second valve plate 23 and affecting the mating seal of the second valve plate 23 relative to the drain hole 15.

[0046] More preferably, flexible rubber sleeves (not shown in the figure, the same below) are sleeved on the outer peripheries of the first valve plate 22 and the second valve plate 23. The flexible rubber sleeves can be specifically made of flexible materials such as rubber, silica gel, plastic, and foam, and the closing and sealing effects of the first valve plate 22 and the second valve plate 23 are improved through the flexible rubber sleeves.

[0047] Preferably, the volumetric flow measurement device 1000 further includes a third liquid level sensing component 4 and an alarm module 5. The third liquid level sensing component 4 is arranged above the water inlet hole 13, and the alarm module 5 is electrically connected to the third liquid level sensing component 4 and is used to send an alarm signal when the third liquid level sensing component 4 detects a liquid level signal.

[0048] When the water inlet hole 14 or the drain hole 15 is blocked and cannot drain smoothly, the water level in the water collecting chamber 11 rises to the installation height of the third liquid level sensing component 4 and is detected by the third liquid level sensing component 4. At this time, an alarm signal is sent through the alarm module 5, specifically, an audible and visual alarm signal or a wireless alarm signal can be sent to timely notify relevant personnel for emergency handling.

[0049] Preferably, an overflow hole (not shown in the figure, the same below) communicating with the water collecting chamber 11 is also provided at the top end of the water tank 1. When the water inlet hole 14 or the drain hole 15 is blocked and cannot drain smoothly, the liquid in the water collecting chamber 11 can be normally discharged along the overflow hole, avoiding complete blockage of the pipeline.

[0050] In other embodiments, an electromagnetic flowmeter can also be provided at the overflow hole. The electromagnetic flowmeter is used to detect the liquid flow rate discharged through the overflow hole in real time, and can assist in measuring the flow rate exceeding the range of the measuring mechanism 3, improving the range and measurement accuracy of the volumetric flow measuring device 1000 and enhancing the applicability.

[0051] Preferably, the water tank 1 further includes a partition plate 16 and a bottom plate 17. The partition plate 16 is arranged between the water collecting chamber 11 and the measuring chamber 12 and is provided with the water inlet hole 14. The bottom plate 17 is arranged at the bottom end of the measuring chamber 12 and is provided with the drain hole 15. The top surface of the partition plate 16 is inclined downward towards the water inlet hole 14, and the top surface of the bottom plate 17 is inclined downward towards the drain hole 15. The inclined structures on the partition plate 16 and the bottom plate 17 guide the liquid and solid waste in the corresponding cavities to be discharged, making the drainage smoother, effectively avoiding hanging garbage and blockage.

[0052] Please combine Figure 1 and Figure 2 , a plurality of legs 6 are arranged at the bottom of the water tank 1. The plurality of legs 6 are arranged around the drain hole 15 and are used to jointly support the water tank 1. Thus, the water tank 1 is erected at a certain height position through the plurality of legs 6, stably supporting the water tank 1 and making the bottom of the drain hole 15 have no shielding structure, making the drainage of the drain hole 15 smoother.

[0053] As a second aspect, an embodiment of the present invention further provides an underground drainage system (not shown in the figure, the same below), including the above-mentioned volumetric flow measuring device 1000. The underground drainage system monitors the drainage flow rate in real time through the volumetric flow measuring device 1000. The flow measurement structure is simple and efficient, with low cost and high measurement accuracy, and there is no undetected gap, providing comprehensive and accurate drainage flow rate data.

[0054] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A volumetric flow measurement device, characterized in that, It includes a water tank (1), a valve mechanism (2) and a measuring mechanism (3); The inner cavity of the water tank (1) is vertically divided into a water collecting cavity (11) and a measuring cavity (12) located below the water collecting cavity (11). An inlet hole (13) is provided at the upper part of the water collecting cavity (11). A water diversion hole (14) is provided between the water collecting cavity (11) and the measuring cavity (12). A drain hole (15) is provided at the bottom end of the measuring cavity (12). The apertures of the water diversion hole (14) and the drain hole (15) are both larger than the aperture of the inlet hole (13); The valve mechanism (2) includes a driving component (21), and a first valve plate (22) and a second valve plate (23) respectively connected to the driving component (21). The driving component (21) includes a first driving state and a second driving state. The first driving state of the driving component (21) is to drive the first valve plate (22) to block the water diversion hole (14) and at the same time drive the second valve plate (23) to open the drain hole (15). The second driving state of the driving component (21) is to drive the first valve plate (22) to open the water diversion hole (14) and at the same time drive the second valve plate (23) to block the drain hole (15); The measuring mechanism (3) includes a first liquid level sensing component (31), a second liquid level sensing component (32) and a timing component. The first liquid level sensing component (31) is arranged at the bottom of the measuring cavity (12) and is used to send a signal to drive the driving component (21) to switch to the second driving state when the measuring cavity (12) is empty. The second liquid level sensing component (32) is arranged at a position higher than the first liquid level sensing component (31) in the measuring cavity (12) or at a position lower than the inlet hole (13) in the water collecting cavity (11). The second liquid level sensing component (32) is used to send a signal to drive the driving component (21) to switch to the first driving state when the liquid level in the water tank (1) reaches a preset height. The timing component is used to count the duration when the liquid level in the water tank (1) reaches the preset height.

2. The volumetric flow rate measuring device according to claim 1, wherein The volumetric flow measurement device further includes an exhaust passage. The first end of the exhaust passage is communicated with the measuring cavity (12), and the second end of the exhaust passage is arranged at a position higher than the inlet hole (13) and is used to conduct with the external environment.

3. The volumetric flow rate measuring device according to claim 1, wherein The volumetric flow measurement device further includes a periodic timing component for adjusting the detection cycle duration. The periodic timing component is used to send a signal to drive the driving component (21) to switch to the first driving state when the liquid level in the water tank (1) cannot reach the preset height within the preset detection cycle duration.

4. The volumetric flow measurement device according to claim 1, characterized in that, The valve mechanism (2) further includes a transmission rod (24). The driving assembly (21) is connected to the transmission rod (24) and is used to drive the transmission rod (24) to move axially along it. The water inlet hole (14) and the drain hole (15) are both coaxially arranged relative to the transmission rod (24). The first valve plate (22) is connected to the transmission rod (24) and is arranged at one end of the water inlet hole (14) facing the measurement chamber (12). The second valve plate (23) is connected to the transmission rod (24) and is arranged at one end of the drain hole (15) facing the measurement chamber (12).

5. The volumetric flow measurement device according to claim 4, characterized in that, One end of the first valve plate (22) facing the water inlet hole (14) is provided with a first conical structure (221) whose diameter gradually expands in the direction away from the water inlet hole (14). One end of the second valve plate (23) facing the drain hole (15) is provided with a second conical structure (231) whose diameter gradually expands in the direction away from the drain hole (15).

6. The volumetric flow rate measuring device according to claim 5, characterized in that, One end of the second valve plate (23) away from the drain hole (15) is provided with a third conical structure (232) whose diameter gradually decreases in the direction away from the drain hole (15).

7. The volumetric flow rate measuring device according to any one of claims 1 to 6, characterized in that Flexible rubber sleeves are sleeved on the outer peripheries of the first valve plate (22) and the second valve plate (23).

8. The volumetric flow rate measuring device according to any one of claims 1 to 6, characterized in that, The water inlet hole (13) is arranged on the side wall of the upper part of the water collecting chamber (11); The volumetric flow measurement device further includes a third liquid level sensing assembly (4) and an alarm module (5). The third liquid level sensing assembly (4) is arranged above the water inlet hole (13). The alarm module (5) is electrically connected to the third liquid level sensing assembly (4) and is used to emit an alarm signal when the third liquid level sensing assembly (4) detects a liquid level signal.

9. The volumetric flow rate measuring device according to claim 1, characterized in that, The water tank (1) further includes a partition plate (16) and a bottom plate (17). The partition plate (16) is arranged between the water collecting chamber (11) and the measurement chamber (12) and is provided with the water inlet hole (14). The bottom plate (17) is arranged at the bottom end of the measurement chamber (12) and is provided with the drain hole (15). The top surface of the partition plate (16) is inclined downward toward the water inlet hole (14). The top surface of the bottom plate (17) is inclined downward toward the drain hole (15).

10. An underground drainage system, characterized in that, Including the volumetric flow measurement device according to any one of claims 1 to 9.

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