CN111595393A - Device and method for measuring flow in drainage pipeline - Google Patents
Device and method for measuring flow in drainage pipeline Download PDFInfo
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- CN111595393A CN111595393A CN202010541391.3A CN202010541391A CN111595393A CN 111595393 A CN111595393 A CN 111595393A CN 202010541391 A CN202010541391 A CN 202010541391A CN 111595393 A CN111595393 A CN 111595393A
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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
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
Abstract
The invention discloses a device and a method for measuring flow in a drainage pipeline, and belongs to the technical field of pipeline flow detection. The method comprises the following steps: firstly, measuring the length L and the diameter D of a pipeline to be measured, and calculating the radius r of the pipeline; and then adding an indicator into the front end inspection well of the pipeline to be detected through an indicator adding device, monitoring indicator concentration data at the rear end inspection well of the pipeline to be detected and liquid level data h in the pipeline to be detected through an indicator detection system, recording time t required for detecting the increase of the indicator concentration from the addition of the indicator to the rear end inspection well, and calculating the water flow velocity in the pipeline to be detected and the flow area of the pipeline according to L, D, r, h and t so as to calculate the flow in the pipeline. The method is simple and convenient to operate, low in cost, free of influence of the shape of the pipeline and the fullness of the pipeline, and wide in application scene.
Description
Technical Field
The invention relates to a device and a method for measuring flow in a drainage pipeline, and belongs to the technical field of pipeline flow detection.
Background
The conditions in urban drainage pipelines are complex and changeable, the filling degree in the pipelines is different in different water consumption periods, and the flow in the pipelines can be changed along with the influence of different blockage conditions.
At present, two common methods for detecting the flow of the drainage pipeline are provided, one is to detect the flow in the pipeline through an electric wave flow velocity meter, and the other is to detect the flow in the pipeline through an ultrasonic Doppler flow meter. The electric wave current meter is a non-contact flow detector, which is not suitable for full pipe flow detection; the ultrasonic Doppler flowmeter can be well suitable for various pipeline scenes, but the detection result is often influenced due to different installation heights, for example, the ultrasonic Doppler flowmeter is installed at an inspection well or the bottom of a pipeline and is influenced by bottom silt, and if the ultrasonic Doppler flowmeter is installed at the top, the situation that the flow cannot be detected by non-full pipe flow can occur.
Disclosure of Invention
The method is simple and convenient to operate and low in cost, and compared with a method for measuring the flow of a pipeline by adopting a flowmeter, the flow measuring method cannot be influenced by the shape of the pipeline and the fullness of the pipeline, and has wider application scenes.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
a device for measuring the flow in a drainage pipeline comprises an indicator detection system and an indicator feeding device, wherein the indicator feeding device is installed in a front-end inspection well of a pipeline to be measured and is used for feeding an indicator into the front-end inspection well; the indicator detection system is arranged in a rear-end inspection well of the pipeline to be measured and is used for monitoring the liquid level in the pipeline to be measured and the concentration of the indicator in the rear-end inspection well.
As a preferred scheme, the indicator detection system comprises an indicator data sensor, a liquid level sensor, a data transmission module, a cloud platform and a power supply system, wherein the indicator data sensor continuously acquires indicator concentration data of a rear-end inspection well to be measured and sends the indicator concentration data to the cloud platform through the data transmission module for storage and recording, the liquid level sensor continuously acquires liquid level data in a pipeline to be measured and sends the liquid level data to the cloud platform through the data transmission module for storage and recording, and the power supply system is used for providing electric energy.
The method for measuring the flow in the drainage pipeline by adopting the device comprises the following steps:
(1) measuring the length L and the diameter D of a pipeline to be detected, calculating the radius r of the pipeline to be detected to be D/2, installing an indicator adding device in an inspection well at the front end of the pipeline to be detected, and installing an indicator detecting system in an inspection well at the rear end of the pipeline to be detected;
(2) starting an indicator adding device, and adding the indicator into the inspection well at the front end of the pipeline to be measured by the indicator adding device;
(3) when the indicator data sensor detects that the concentration of the indicator at the rear-end inspection well is increased, recording the time t required by the increase of the concentration of the indicator detected from the addition of the indicator to the rear-end inspection well, and calculating the flow velocity of water in the pipeline to be measured according to a formula v, L/t;
(4) the liquid level sensor in the pipeline rear end inspection shaft that is arranged in awaiting measuring gathers the liquid level data h in the pipeline that awaits measuring in succession to send to the cloud platform through data transmission module and store the record, calculate the area A that flows of pipeline according to the following formula according to the fullness of pipeline:
when in use
When the temperature of the water is higher than the set temperature,
when in use
When the temperature of the water is higher than the set temperature,
when in use
When the temperature of the water is higher than the set temperature,
(5) and calculating the flow Q in the pipeline to be measured according to the formula Q-V.A.
From the above description, it can be seen that the present invention has the following advantages:
(1) the method is simple and convenient to operate and low in cost, compared with a method for measuring the flow of the pipeline by adopting a flowmeter, the method for measuring the flow cannot be influenced by the shape of the pipeline and the fullness of the pipeline, and has wider application scenes.
Drawings
FIG. 1 is a schematic diagram of the structure of the apparatus of the present invention;
FIG. 2 is a schematic diagram of the construction of an indicator detection system of the present invention;
FIG. 3 is a schematic cross-sectional view of a pipe under test when the pipe fullness is less than 0.5;
FIG. 4 is a schematic cross-sectional view of the pipe under test at a pipe fullness equal to 0.5;
FIG. 5 is a schematic cross-sectional view of a pipe under test at a pipe fullness greater than 0.5;
FIG. 6 is a schematic structural view of a pipe I to be tested in example 2;
FIG. 7 is a schematic cross-sectional view of a pipe I to be tested in example 2;
FIG. 8 is a schematic structural view of a pipe II to be tested in example 3;
FIG. 9 is a schematic sectional view of a pipe II to be tested in example 3;
reference numerals:
1. the system comprises a front-end inspection well 2, a rear-end inspection well 3, an indicator feeding device 4, an indicator data sensor 5, a liquid level sensor 6, a data transmission module 7, a cloud platform
Detailed Description
The features of the invention will be further elucidated by the following examples, without limiting the claims of the invention in any way.
Example 1
As shown in fig. 1 and fig. 2, a device for measuring the flow in a drainage pipeline comprises an indicator detection system and an indicator adding device 3, wherein the indicator adding device 3 is installed in a front-end inspection well 1 of a pipeline to be measured and is used for adding an indicator into the front-end inspection well 1; indicator detecting system installs in the pipeline rear end inspection shaft 2 of awaiting measuring, indicator detecting system includes indicator data sensor 4, level sensor 5, data transmission module 6, cloud platform 7, power supply system (not shown in the figure), indicator data sensor 4 gathers the indicator concentration data of the pipeline rear end inspection shaft department of awaiting measuring in succession and sends to cloud platform through data transmission module 6 and stores the record, level sensor 5 gathers the liquid level data in the pipeline of awaiting measuring in succession and sends to cloud platform through data transmission module 6 and stores the record, power supply system is used for providing the electric energy.
The method for measuring the flow in the drainage pipeline by adopting the device comprises the following steps:
(1) measuring the length L and the diameter D of a pipeline to be detected, calculating the radius r of the pipeline to be detected to be D/2, installing an indicator adding device 3 in a front-end inspection well 1 of the pipeline to be detected, and installing an indicator detection system in a rear-end inspection well 2 of the pipeline to be detected;
(2) starting an indicator adding device 3, and adding an indicator into the inspection well 1 at the front end of the pipeline to be measured by the indicator adding device 3, wherein the indicator can be an indicator which can cause the change of water quality indexes such as ammonia nitrogen, pH value and conductivity, and can also be an indicator which does not cause the change of the water quality indexes;
(3) the method comprises the steps that an indicator data sensor 4 located in a rear-end inspection well 2 of a pipeline to be measured continuously collects indicator concentration data of the rear-end inspection well 2 and sends the indicator concentration data to a cloud platform 7 through a data transmission module 6 to store records, when the indicator data sensor 4 detects that the concentration of an indicator at the rear-end inspection well 2 is increased, the time t required by the increase of the concentration of the indicator from the addition of the indicator to the detection of the indicator at the rear-end inspection well 2 is recorded, and the flow speed of water flow in the pipeline to be measured is calculated according to a formula v which is L/t;
(4) the liquid level sensor 5 positioned in the inspection well 2 at the rear end of the pipeline to be detected continuously collects liquid level data h in the pipeline to be detected, sends the liquid level data h to the cloud platform 7 through the data transmission module 6 to store records, and calculates the flow area A of the pipeline according to the following formula according to the fullness of the pipeline:
when h/D<At 0.5, A ═ r, as shown in FIG. 32θ -OB · AB, where OB is r-h, θ is arccos (OB/OA), and AB is r · sin θ, has:
when in use
When the temperature of the water is higher than the set temperature,
when h/D is 0.5, as shown in fig. 4,
when h/D>At 0.5, A ═ π r, as shown in FIG. 52-r2θ -OB · AB, where OB is D-h, θ is arccos (OB/OA), and AB is r · sin θ, has:
when in use
When the temperature of the water is higher than the set temperature,
(5) and calculating the flow Q in the pipeline to be measured according to the formula Q-V.A.
Example 2
The structure of the pipeline i to be tested is shown in fig. 6 and 7, wherein, the inspection well No. 2 is the front end inspection well 1, the inspection well No. 1 is the rear end inspection well 2, the flow rate in the pipeline i to be tested is measured by the same method as the embodiment 1, the pipeline length L and the pipeline diameter D of the pipeline i to be tested are measured to be 37m and 400mm, the pipeline radius r is calculated to be 200mm, the time t required by adding the indicator from the inspection well No. 2 to detecting the increase of the indicator concentration in the inspection well No. 1 is recorded to be 168s, and the liquid level data h in the pipeline is 50 mm.
Calculating the flow velocity v of the water flow in the pipeline I to be measured, wherein the flow velocity v is L/t, 37/168 is 0.22 m/s;
the pipeline fullness h/D is calculated to be 50/400-0.125 < 0.5, so that A-r2θ -OB · AB, where OB-r-h is 150, θ -arcos (OB/OA) is arcos (150/200) 41 ° -0.715, and AB is r · Sin θ is 200 · Sin41 ° -0.132 m, so a is θ · r · h is 150, and a is r ═ 41 ° -0.7152-OB·AB＝0.715·0.22-0.15·0.132＝0.0088m2
Therefore, the flow Q in the pipeline is 0.22.0.0088 to 0.0019m3/s＝6.84m3/h。
Example 3
The structure of the pipeline ii to be tested is shown in fig. 8 and 9, wherein, the inspection well No. 3 is the front end inspection well 1, the inspection well No. 4 is the rear end inspection well 2, the flow rate in the pipeline i to be tested is measured by the same method as in example 1, the pipeline length L and the pipeline diameter D of the pipeline i to be tested are measured to be 60m and 500mm, the pipeline radius r is calculated to be 250mm, the time t required by adding the indicator from the inspection well No. 3 to detecting the increase of the indicator concentration at the inspection well No. 4 is recorded to be 420s, and the liquid level data h in the pipeline is 250 mm.
Calculating the flow velocity v of the water flow in the pipeline II to be measured, wherein the flow velocity v is L/t, 60/420 is 0.143 m/s;
the pipeline fullness h/D is calculated as 0.5-250/500, so
Therefore, the flow rate Q in the pipe is 0.143.0.098 to 0.014m3/h＝50.5m3/h。
It should be understood that the detailed description of the invention is merely illustrative of the invention and is not intended to limit the invention to the specific embodiments described. It will be appreciated by those skilled in the art that the present invention may be modified or substituted equally as well to achieve the same technical result; as long as the use requirements are met, the method is within the protection scope of the invention.
Claims (3)
1. The device for measuring the flow in the drainage pipeline is characterized by comprising an indicator detection system and an indicator adding device, wherein the indicator adding device is arranged in a front-end inspection well of the pipeline to be measured and is used for adding an indicator into the front-end inspection well; the indicator detection system is arranged in a rear-end inspection well of the pipeline to be measured and is used for monitoring the liquid level in the pipeline to be measured and the concentration of the indicator in the rear-end inspection well.
2. The device of claim 1, wherein the indicator detection system comprises an indicator data sensor, a liquid level sensor, a data transmission module, a cloud platform and a power supply system, the indicator data sensor continuously collects indicator concentration data of the rear inspection well to be measured and sends the indicator concentration data to the cloud platform through the data transmission module for storage and recording, the liquid level sensor continuously collects liquid level data in the pipeline to be measured and sends the indicator concentration data to the cloud platform through the data transmission module for storage and recording, and the power supply system is used for providing electric energy.
3. A method of measuring flow in a drain pipeline using the apparatus of claim 2, comprising the steps of:
(1) measuring the length L and the diameter D of a pipeline to be detected, calculating the radius r of the pipeline to be detected to be D/2, installing an indicator adding device in an inspection well at the front end of the pipeline to be detected, and installing an indicator detecting system in an inspection well at the rear end of the pipeline to be detected;
(2) starting an indicator adding device, and adding the indicator into the inspection well at the front end of the pipeline to be measured by the indicator adding device;
(3) when the indicator data sensor detects that the concentration of the indicator at the rear-end inspection well is increased, recording the time t required by the increase of the concentration of the indicator detected from the addition of the indicator to the rear-end inspection well, and calculating the flow velocity of water in the pipeline to be measured according to a formula v, L/t;
(4) the liquid level sensor in the pipeline rear end inspection shaft that is arranged in awaiting measuring gathers the liquid level data h in the pipeline that awaits measuring in succession to send to the cloud platform through data transmission module and store the record, calculate the area A that flows of pipeline according to the following formula according to the fullness of pipeline:
when in use
When the temperature of the water is higher than the set temperature,
when in use
When the temperature of the water is higher than the set temperature,
when in use
When the temperature of the water is higher than the set temperature,
(5) and calculating the flow Q in the pipeline to be measured according to the formula Q-V.A.
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| CN202010541391.3A CN111595393A (en) | 2020-06-15 | 2020-06-15 | Device and method for measuring flow in drainage pipeline |
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| CN202010541391.3A CN111595393A (en) | 2020-06-15 | 2020-06-15 | Device and method for measuring flow in drainage pipeline |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113125308A (en) * | 2021-03-18 | 2021-07-16 | 同济大学 | Test system for inducing osmotic corrosion phenomenon by suction barrel penetration and upward pulling |
| CN115144042A (en) * | 2022-09-05 | 2022-10-04 | 中国水利水电科学研究院 | Method for measuring flow of non-full pipeline |
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Cited By (4)
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