CN111207796A - Drainage pipeline and open channel flow measuring device - Google Patents
Drainage pipeline and open channel flow measuring device Download PDFInfo
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- CN111207796A CN111207796A CN202010046962.6A CN202010046962A CN111207796A CN 111207796 A CN111207796 A CN 111207796A CN 202010046962 A CN202010046962 A CN 202010046962A CN 111207796 A CN111207796 A CN 111207796A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052744 lithium Inorganic materials 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 13
- 239000012530 fluid Substances 0.000 description 24
- 238000010586 diagram Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 3
- 241000219307 Atriplex rosea Species 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/002—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow wherein the flow is in an open channel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C13/00—Surveying specially adapted to open water, e.g. sea, lake, river or canal
- G01C13/008—Surveying specially adapted to open water, e.g. sea, lake, river or canal measuring depth of open water
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/001—Full-field flow measurement, e.g. determining flow velocity and direction in a whole region at the same time, flow visualisation
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- Engineering & Computer Science (AREA)
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- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Aviation & Aerospace Engineering (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a drainage pipeline and open channel flow measuring device in the technical field of flow measurement, which has the characteristics of simple structure, capability of recording measurement data, namely, immediate assembly and disassembly without immediate assembly, small influence by water quality and wide application range, and comprises a first supporting rod and a second supporting rod, wherein one end of the first supporting rod is in threaded connection with one end of the second supporting rod, the other end of the first supporting rod is connected with a first supporting disc, and the other end of the second supporting rod is connected with a second supporting disc; a sealed central control box is fixed on the first supporting rod, and the data collector is fixed in the sealed central control box; the second supporting rod is connected with a plurality of sensor fixing rods, the sensor fixing rods are provided with flow velocity sensors and water depth sensors, and the flow velocity sensors and the water depth sensors are connected with the data collector through data wires.
Description
Technical Field
The invention belongs to the technical field of flow measurement, and particularly relates to a drainage pipeline and open channel flow measurement device.
Background
Point source pollution and area source pollution are main sources of river water body pollution, under the promotion of national environmental protection policies, each department pays more and more attention to pollutant discharge control, point source pollution discharge amount is strictly controlled, and effective monitoring of area source pollution discharge amount is the key for formulating an area source control scheme and improving the water body environment. After point source pollution is effectively controlled, non-point source pollution is more and more emphasized, and particularly the non-point source pollution generated by urban rainfall runoff becomes a main pollution source of urban river water.
In urban areas, pipelines and open channels are the main components of urban drainage systems and play an important role in transporting water. Runoff generated by rainfall flows into a drainage pipeline or an open channel and is finally input into a river. The fluid in the pipeline is mostly in a non-full pipe flow state, namely, the cross section of the pipeline is not completely filled with water. In an urban area non-point source pollution model, the parameter calibration and result verification of the model need to be carried out according to the outlet flow of a drain pipe and the flow of an open channel, and therefore a flow measuring device needs to be installed to monitor the flow for a long time.
The traditional method for measuring the non-full flow of the pipeline and the flow of the open channel has a large amount of head loss, so that the measurement precision is low, and when the flow is too large or too small, the measurement precision is reduced, even the measurement cannot be carried out. In addition, the measurement data is difficult to store, and high-time-resolution long-time continuous measurement cannot be realized. If the electromagnetic flowmeter is used for measuring the drainage pipeline, corresponding auxiliary engineering facilities need to be additionally built, the construction cost is high, and the urban drainage pipeline belongs to municipal facilities and is difficult to be reconstructed or destructively installed; in addition, the drainage pipeline has more fluid impurities, so that the device is easy to block. The non-full pipe flow rate measuring method includes an ultrasonic method, that is, the fluid velocity is measured by adopting ultrasonic waves, radio waves and the like according to the Doppler principle, and then the fluid flow rate is measured by matching with a liquid level measuring device. With the development of technology, flow meters currently using the doppler principle can be used for measuring non-full pipe flow, but still have some disadvantages: firstly, the principle flowmeter can only measure a circular drainage pipeline and cannot measure the flow of an open channel; secondly, the principle flow meter is mostly imported from abroad, is expensive and high in later maintenance cost, and is difficult to apply in a large range; thirdly, the fluid in the drainage pipeline and the open channel is heterogeneous, and a flowmeter based on the ultrasonic wave or radio wave principle has large errors in measurement; finally, installation and power supply are complex, and installation and removal immediately after use cannot be achieved.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a drainage pipeline and open channel flow measuring device which has the characteristics of simple structure, capability of recording measuring data, small influence by water quality and wide application range, and the device can be assembled and disassembled immediately after use.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a drainage pipeline and open channel flow measuring device comprises a first supporting rod and a second supporting rod, wherein one end of the first supporting rod is in threaded connection with one end of the second supporting rod, the other end of the first supporting rod is connected with a first supporting disc, and the other end of the second supporting rod is connected with a second supporting disc; a sealed central control box is fixed on the first supporting rod, and a data collector is fixed in the sealed central control box; the second supporting rod is connected with a plurality of sensor fixing rods, the sensor fixing rods are provided with flow velocity sensors and water depth sensors, and the flow velocity sensors and the water depth sensors are connected with the data collector through data wires.
The sensor fixing rod is connected with the second supporting rod through a cross strut fixing clamp; the sealed central control box is connected with the first supporting rod through a clamping hoop.
One side of the sealed center control box is provided with a through hole, the data wire penetrates through the through hole to be connected with the data collector, and a sealing rubber sleeve is arranged between the through hole and the data wire.
First bracing piece the second bracing piece with the sensor dead lever is the cavity pole and all is equipped with the confession the wire guide that the data wire passed, the data wire is followed respectively the sensor dead lever the second bracing piece with the inside of first bracing piece is passed.
The first supporting rod is provided with an internal thread, the second supporting rod is provided with an external thread matched with the internal thread, and the second supporting rod is nested in the first supporting rod.
The outer surfaces of the first supporting rod and the second supporting rod are provided with scales.
The first support rod is in threaded connection with the first support disc; the second support rod is in threaded connection with the second support plate.
The flow velocity sensor is a rotary cup type flow velocity meter.
The water depth sensor is a pressure sensor.
The data collector is a self-recording type storable data collector, and the model is as follows: and LS-B adopts a lithium battery for power supply.
Compared with the prior art, the invention has the following beneficial effects: the first support rod and the second support rod which are connected through the threads are arranged in the drainage pipeline or the open channel, the mounting size is adjustable, the device can adapt to various drainage pipelines or open channels with different specifications, and the device has the characteristics of simple structure, and can be mounted and dismounted immediately after use; the flow velocity is measured by the flow velocity sensor, the water depth is measured by the water depth sensor, the flow velocity is obtained by combining the geometric dimension of the flow channel at the installation position, the influence of water quality is small in the measurement process, and the method has the characteristic of wide application range; meanwhile, the self-recording type storable data collector can record the measured data and can be used for subsequent analysis and research.
Drawings
Fig. 1 is a schematic overall structure diagram of a drainage pipeline and an open channel flow measuring device according to an embodiment of the present invention;
FIG. 2 is an installation schematic diagram of a drainage pipeline and an open channel flow measuring device for measuring water flow in the drainage pipeline according to an embodiment of the present invention;
FIG. 3 is an installation schematic diagram of a drainage pipeline and an open channel flow measuring device for measuring water flow in an open channel according to an embodiment of the invention;
FIG. 4 is a schematic diagram illustrating a principle of measuring water flow in a drainage pipeline by using a drainage pipeline and an open channel flow measuring device provided by an embodiment of the invention;
FIG. 5 is a schematic diagram of a principle of measuring water flow in an open channel by using a drainage pipeline and an open channel flow measuring device provided by the embodiment of the invention;
in the figure: 1. the device comprises a first supporting disc, a sealed center control box, a data collector, a data lead, a first supporting rod, a second supporting rod, a flow velocity sensor, a sensor fixing rod, a second supporting disc, a water depth sensor, a drainage pipeline, a pipeline fluid, a channel fluid, an open channel and an open channel fluid, wherein the sealed center control box comprises 2, 3, the data collector, 4, the data lead, 5, the first supporting rod, 6, the second supporting rod, 7, the flow velocity sensor, 8, the sensor fixing rod, 9, the second supporting disc.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
It should be noted that in the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. As used in the description of the present invention, the terms "front," "back," "left," "right," "up," "down" and "in" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in fig. 1, in this embodiment, the first support rod 5 is a hollow rod, the inner surface of the hollow rod is provided with an internal thread, the internal thread penetrates through the whole inner surface of the first support rod 5, the second support rod 6 is a hollow rod, the outer surface of the hollow rod is provided with an external thread, the external thread penetrates through the whole outer surface of the second support rod 6, one end of the second support rod 6 is nested in the first support rod 5 and is in threaded connection with the first support rod 5, the other end of the second support rod is in threaded connection with the second support plate 9, the second support plate 9 is provided with a groove, and the groove is internally provided; the other end of the first supporting rod 5 is in threaded connection with the first supporting disk 1, a boss is arranged on the first supporting disk 1, and an external thread matched with the internal thread on the first supporting rod 5 is arranged on the boss. On sealed central control box 2 was fixed in first bracing piece 5 through the clamp, data collector 3 was fixed in sealed central control box 2, and the effect of sealed central control box 2 is protection data collector 3, and the mounted position is close to first supporting disk 1 one side. Two sensor fixed rods 8 are respectively fixed on a second supporting rod 6 through cross-shaped supporting column fixing clamps, the tail end of one sensor fixed rod 8 is connected with a flow velocity sensor 7, the tail end of the other sensor fixed rod 8 is connected with a water depth sensor 10, and the flow velocity sensor 7 and the water depth sensor 10 transmit detected data to a data collector 3 through a data wire 4. In this embodiment, first bracing piece 5, second bracing piece 6 and sensor dead lever 8 are the cavity pole and all are equipped with the wire guide that supplies data wire 4 to pass, and data wire 4 passes from the inside of sensor dead lever 8, second bracing piece 6 and first bracing piece 5 respectively, prevents that data wire 4 from exposing outside to be twined together with the impurity of aquatic, leads to the not smooth emergence of reaching data wire 4 and damage the phenomenon. One side of the sealed central control box 2 is provided with a through hole, the data lead 4 passes through the through hole to be connected with the data collector 3, and a sealing rubber sleeve is arranged between the through hole and the data lead 4 to prevent water in a drainage pipeline or an open channel from entering the sealed central control box 2.
As shown in fig. 2, when the present embodiment is applied to a drainage pipeline, the assembled measuring device is vertically placed in the drainage pipeline 11, the first support rod 5 is located at the top, the second support rod 6 is located at the bottom, the first support rod 5 is rotated to tightly clamp the device on the upper and lower inner walls of the drainage pipeline 11, and the first support disc 1 and the second support disc 9 have arc surfaces adapted to the inner wall surface of the drainage pipeline 11, so as to increase the contact area between the measuring device and the drainage pipeline 11, increase the friction force, and prevent the measuring device from being washed away by water flow. The position of the sensor fixing rod 8 is adjusted through the cross-shaped support fixing clamp, the water depth sensor 10 is tightly attached to the bottom of the drainage pipeline 11, the flow velocity sensor 7 is located at the lower part of the drainage pipeline 11, the flow velocity sensor 7 can be immersed in water flow, and the orientation of the flow velocity sensor 7 meets the measurement requirement. The outer surfaces of the first supporting rod 5 and the second supporting rod 6 are respectively sprayed with red scales, and after the measuring device is installed, the diameters of the drainage pipeline 11 can be obtained through the scales on the first supporting rod 5 and the second supporting rod 6.
As shown in figures 2 and 4, the pipeline flow at any measuring time is obtained through the radius d/2 of the pipeline and the fluid level height hThe cross-sectional area of the body 12, the product of the average flow velocity and the cross-sectional area is calculated to obtain the flow Q of the pipeline at any time, and the flow Q of the pipeline fluid 12 flowing through the drainage pipeline 11 at any time ttIt can be calculated by the following formula:
Qt＝At×Vt(1)
in the formula, QtThe flow rate of the pipeline fluid 12 flowing through the drainage pipeline 11 at any time t; a. thetThe area of the section of the pipeline at the moment t; vtRepresenting the flow rate of the pipeline fluid 12 through the section at time t.
For a given drainage pipeline 11, the pipe diameter d can be obtained by scale marks on the outer surfaces of the first supporting rod 5 and the second supporting rod 6, the flow velocity sensor 7 measures the flow velocity of the pipeline fluid 12 as the flow velocity of the pipeline fluid 12 at a certain moment, and the water depth sensor 10 measures the liquid level height of the pipeline fluid 12 at the moment; at any time t, the cross-sectional area At of the pipeline fluid 12 flowing through the drain pipeline 11 is calculated as follows:
in the formula, htRepresenting the water depth at time t; d represents the pipe diameter; θ represents the fill angle in radians.
As shown in fig. 3, when the present embodiment is applied to an open channel, the assembled measuring device is horizontally placed above the water surface of the open channel 13, and the first support rod 5 is rotated to tightly clamp the first support disc 1 and the second support disc 9 on the inner wall of the open channel 13, so that the first support disc 1 and the second support disc 9 can increase the contact area between the measuring device and the open channel 13, increase the friction force, and prevent the measuring device from being tilted or washed away by water flow. The position of the sensor fixing rod 8 is adjusted through the cross-shaped support fixing clamp, the water depth sensor 10 is tightly attached to the bottom of the open channel 13, the flow velocity sensor 7 is located at the lower portion of the open channel 13, water can immerse the flow velocity sensor 7, and the orientation of the flow velocity sensor 7 meets the measurement requirement. The outer surfaces of the first supporting rod 5 and the second supporting rod 6 are respectively sprayed with red scales, and after the measuring device is installed, the width of the open channel 13 can be obtained through the scales on the first supporting rod 5 and the second supporting rod 6.
As shown in fig. 3 and 5, the flow velocity sensor 7 measures the flow velocity of the open channel fluid 14 as the flow velocity of the open channel fluid 14 at a certain time, the water depth sensor 10 measures the liquid level height of the open channel fluid 14 at that time, and the second support bar 6 and the first support bar 5 are marked as the width of the open channel 13. The cross-sectional area of the open channel fluid 14 at any measuring time is obtained through the width m of the open channel 13 and the fluid level height n, the product of the average flow velocity and the cross-sectional area is calculated to obtain the flow q of the open channel at any time, and the flow q of the open channel fluid 14 flowing through the open channel 13 at any time t is obtainedtThis can be calculated by the following equation.
qt＝m×nt×vt(4)
In the formula, qtThe flow rate of the open channel fluid 14 flowing through the open channel 13 at any time t; m is the width of the open channel; n istRepresenting the water depth at time t; v. oftRepresenting the flow rate of the open channel fluid 12 through the section at time t.
In this embodiment, the flow velocity sensor 7 is a rotating cup type flow velocity meter, the water depth sensor 10 is a pressure sensor, the data collector 3 is a self-recording type storable data collector, and the model is: and the LS-B is powered by lithium batteries and can be externally connected with a plurality of groups of lithium batteries. The rotary cup type current meter, the pressure sensor, the data collector, the hoop, the cross strut fixing clamp and the like are all commercially available products.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A drainage pipeline and open channel flow measuring device is characterized by comprising a first supporting rod and a second supporting rod, wherein one end of the first supporting rod is in threaded connection with one end of the second supporting rod, the other end of the first supporting rod is connected with a first supporting disc, and the other end of the second supporting rod is connected with a second supporting disc; a sealed central control box is fixed on the first supporting rod, and a data collector is fixed in the sealed central control box; the second supporting rod is connected with a plurality of sensor fixing rods, the sensor fixing rods are provided with flow velocity sensors and water depth sensors, and the flow velocity sensors and the water depth sensors are connected with the data collector through data wires.
2. The drainage pipeline and open channel flow measuring device of claim 1, wherein the sensor fixing rod is connected with the second support rod through a cross strut fixing clamp; the sealed central control box is connected with the first supporting rod through a clamping hoop.
3. The drainage pipeline and open channel flow measuring device of claim 1, wherein a through hole is formed in one side of the sealed central control box, the data lead penetrates through the through hole to be connected with the data collector, and a sealing rubber sleeve is arranged between the through hole and the data lead.
4. The drainage pipeline and open channel flow measuring device according to claim 1, wherein the first support rod, the second support rod and the sensor fixing rod are hollow rods and are provided with wire holes for the data wires to pass through, and the data wires pass through the sensor fixing rod, the second support rod and the first support rod respectively.
5. The drainage pipeline and open channel flow measuring device of claim 4, wherein the first support rod is provided with an internal thread, the second support rod is provided with an external thread matched with the internal thread, and the second support rod is nested in the first support rod.
6. The drainage pipeline and open channel flow measuring device of claim 1, wherein the outer surfaces of the first support rod and the second support rod are provided with scales.
7. The drainage pipeline and open channel flow measuring device of claim 1, wherein the first support rod is in threaded connection with the first support disc; the second support rod is in threaded connection with the second support plate.
8. The drainpipe and open channel flow measuring device of claim 1, wherein the flow sensor is a rotating cup type flow meter.
9. The drainpipe and open channel flow measuring device of claim 1, wherein the water depth sensor is a pressure sensor.
10. The drainpipe and open channel flow measuring device of claim 1, wherein the data collector is a self-recording storable data collector of the type: and LS-B adopts a lithium battery for power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010046962.6A CN111207796A (en) | 2020-01-16 | 2020-01-16 | Drainage pipeline and open channel flow measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010046962.6A CN111207796A (en) | 2020-01-16 | 2020-01-16 | Drainage pipeline and open channel flow measuring device |
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| CN111207796A true CN111207796A (en) | 2020-05-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010046962.6A Pending CN111207796A (en) | 2020-01-16 | 2020-01-16 | Drainage pipeline and open channel flow measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115574874A (en) * | 2022-11-21 | 2023-01-06 | 江苏水科尚禹能源技术研究院有限公司 | High-precision turbine flowmeter |
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| DE4016529C1 (en) * | 1990-05-22 | 1991-11-07 | Turbo-Werk Messtechnik Gmbh, 5000 Koeln, De | Flowmeter for open duct - has flow sensor movable across channel to supply computer with flow speeds measured at several points |
| CA1304602C (en) * | 1989-06-05 | 1992-07-07 | Paul F. Mahler | Apparatus for and method of determining liquid flow in open channels and conduits |
| DE19857572A1 (en) * | 1998-12-14 | 2000-06-29 | Alfred Schoepf | System for determining through flow vol. per time unit of liquid flow in duct esp. in sewer |
| US8447533B1 (en) * | 2009-10-13 | 2013-05-21 | Eastech Flow Controls, Inc. | Method of wastewater flow measurement, system analysis, and improvement |
| CN107543587A (en) * | 2017-08-30 | 2018-01-05 | 济南大学 | Flow measuring apparatus is blended in a kind of gas-liquid two-phase |
| CN109883478A (en) * | 2019-03-06 | 2019-06-14 | 楼彩飞 | A kind of artificial open channel flow rate measuring device and its flow-measuring method |
| CN110068703A (en) * | 2019-04-26 | 2019-07-30 | 重庆盛厦果时科技有限公司 | Multifunctional pipe drains detection device |
-
2020
- 2020-01-16 CN CN202010046962.6A patent/CN111207796A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1304602C (en) * | 1989-06-05 | 1992-07-07 | Paul F. Mahler | Apparatus for and method of determining liquid flow in open channels and conduits |
| DE4016529C1 (en) * | 1990-05-22 | 1991-11-07 | Turbo-Werk Messtechnik Gmbh, 5000 Koeln, De | Flowmeter for open duct - has flow sensor movable across channel to supply computer with flow speeds measured at several points |
| DE19857572A1 (en) * | 1998-12-14 | 2000-06-29 | Alfred Schoepf | System for determining through flow vol. per time unit of liquid flow in duct esp. in sewer |
| US8447533B1 (en) * | 2009-10-13 | 2013-05-21 | Eastech Flow Controls, Inc. | Method of wastewater flow measurement, system analysis, and improvement |
| CN107543587A (en) * | 2017-08-30 | 2018-01-05 | 济南大学 | Flow measuring apparatus is blended in a kind of gas-liquid two-phase |
| CN109883478A (en) * | 2019-03-06 | 2019-06-14 | 楼彩飞 | A kind of artificial open channel flow rate measuring device and its flow-measuring method |
| CN110068703A (en) * | 2019-04-26 | 2019-07-30 | 重庆盛厦果时科技有限公司 | Multifunctional pipe drains detection device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115574874A (en) * | 2022-11-21 | 2023-01-06 | 江苏水科尚禹能源技术研究院有限公司 | High-precision turbine flowmeter |
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