阅读说明：本技术 一种管道内自流输水流量的测量方法 (Method for measuring flow of self-flowing water delivery in pipeline ) 是由 杨华 卢睿 杨再胜 于 2021-08-23 设计创作，主要内容包括：本发明涉及自流输水流量测量技术领域,且公开了一种管道内自流输水流量的测量方法,包括以下步骤；装配测量装置,获取待测管道的管径和长度,根据管径确定需要测量触点的数量,然后对测量触点进行组装；安装测量装置,将组装好的多个测量触点放置在待测量管道进出口处,然后对进出口处的测量装置进行固定；连接点位信号采集器,将点位信号采集器的电缆分别与多个测量触点上的。该管道内自流输水流量的测量方法,可以快速计算得到水体流量,而且测量步骤简单、装置使用耐久度高、设备制作方便、维护易行,而且安装方便,测量误差小。(The invention relates to the technical field of flow measurement of self-flowing water delivery, and discloses a method for measuring the flow of self-flowing water delivery in a pipeline, which comprises the following steps; assembling a measuring device, acquiring the pipe diameter and the length of a pipeline to be measured, determining the number of contacts to be measured according to the pipe diameter, and then assembling the measuring contacts; installing a measuring device, placing a plurality of assembled measuring contacts at an inlet and an outlet of a pipeline to be measured, and then fixing the measuring device at the inlet and the outlet; and the cable of the point location signal collector is connected with the plurality of measuring contacts respectively. The method for measuring the flow of the self-flowing water in the pipeline can quickly calculate the flow of the water body, and has the advantages of simple measuring steps, high durability of the device, convenient equipment manufacture, easy maintenance, convenient installation and small measuring error.)

1. A measuring method of the flow of the artesian water in the pipeline is characterized in that: comprises the following steps;

step one, assembling a measuring device, acquiring the pipe diameter and the length of a pipeline to be measured, determining the number of contacts to be measured according to the pipe diameter, and then assembling the measuring contacts;

step two, mounting a measuring device, placing a plurality of assembled measuring contacts at an inlet and an outlet of a pipeline to be measured, and then fixing the measuring device at the inlet and the outlet;

connecting a point location signal collector, and respectively connecting cables of the point location signal collector with a plurality of measuring contacts;

and step four, correlating the sectional area numerical values of the artesian water conveying pipeline obtained by the measuring devices at the inlet and the outlet, and calculating the water flow data of the current artesian water conveying pipeline by using a formula.

2. The method for measuring the flow rate of the artesian water in the pipeline according to claim 1, wherein: the formula adopted for calculating the water flow data of the artesian water conveying pipeline is Q (V multiplied by S), the formula V is the artesian water flow velocity, the calculation is carried out according to Bernoulli equation or the existing empirical formula, and S is the area of artesian water when passing through the pipeline.

3. The method for measuring the flow rate of the artesian water in the pipeline according to claim 2, wherein: when water flows through the artesian water conveying pipeline, the measuring device can obtain signal combination data detected by the measuring contact under the liquid level, the liquid level height position h of the water in the artesian water conveying pipeline and the known pipe diameter D of the artesian water conveying pipeline are obtained after binary conversion according to the received signal combination data, and the area S of artesian water conveying when the artesian water passes through the pipeline is calculated through a formula:

h is less than D/2 Area S ═ (θ-SinθCosθ)r² m² h is greater than D/2 Area S ═ (π-θ+SinθCosθ)r² m²

The upper table is a formula for two cases where the liquid level height h is h < D/2 and h > D/2, respectively.

4. The method for measuring the flow rate of the artesian water in the pipeline according to claim 3, wherein: when the water flow liquid level is less than D/2, the signal collector obtains a signal a of the corresponding monitoring point position, and the signal collector transmits the signal a through a modbus protocolSending the data to a calculating unit c, obtaining data bits of signals by decomposing ACSII data, knowing h of evenly distributed installation measuring points and known water pipe diameter D, calculating the angle number of theta and the known water pipe diameter D according to the height position of each measuring point, and using a measuring formula S when h is less than D/2 to be (theta-Sin theta Cos theta) r²And calculating the water flow area in the artesian water conveying pipeline.

5. The method for measuring the flow rate of the artesian water in the pipeline according to claim 3, wherein: when the water flow liquid level exceeds D/2, the signal collector obtains a signal g of a corresponding monitoring point position, the signal collector transmits the signal g to a computing unit c through a modbus protocol, ACSII data are decomposed to obtain a data bit of the signal, h of the measuring point position and the known pipe diameter D of the water pipeline are known to be evenly distributed, the angle number of theta and the known pipe diameter D of the water pipeline are computed according to the height position of each measuring point position, and a measuring formula S ═ when h is more than D/2 (pi-theta + Sin theta Cos theta) r ═ is used²And calculating the water flow area in the artesian water conveying pipeline.

Technical Field

The invention relates to the technical field of flow measurement of self-flowing water delivery, in particular to a method for measuring the flow of self-flowing water delivery in a pipeline.

Background

The gravity flow water delivery is also called gravity water delivery, the water delivery is carried out in a gravity flow mode by using a non-pressure pipe canal through the slope of the bottom of the pipe, the gravity flow water delivery is suitable for water source positions higher than water consumption units, for example, water is taken from a reservoir, the gravity pipe water delivery can be adopted according to terrain and geological conditions, the rapid development of sensing equipment in recent years, various measuring means and modes are changed day by day, and various instruments are continuously upgraded and iterated.

At present, because the self-flowing water conveying in the pipeline has the conditions of full pipe and non-full pipe, the method for measuring the flow of the pipeline cannot completely meet the measurement of the flow of the self-flowing water conveying in the pipeline, and the measurement error is large.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides the method for measuring the flow of the self-flowing water delivery in the pipeline, which can quickly calculate the flow of the water body, has the advantages of simple measuring steps, high durability of the device, convenient equipment manufacture, easy maintenance and convenient installation, does not damage the water delivery pipeline, and solves the problems that the method for measuring the flow of the pipeline cannot completely meet the measurement of the flow of the self-flowing water delivery in the pipeline and has larger measuring error.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a measuring method of the flow of the artesian water delivery in the pipeline comprises the following steps;

step one, assembling a measuring device, acquiring the pipe diameter and the length of a pipeline to be measured, determining the number of contacts to be measured according to the pipe diameter, and then assembling the measuring contacts;

step two, mounting a measuring device, placing a plurality of assembled measuring contacts at an inlet and an outlet of a pipeline to be measured, and then fixing the measuring device at the inlet and the outlet;

connecting a point location signal collector, and respectively connecting cables of the point location signal collector with a plurality of measuring contacts;

and step four, correlating the sectional area numerical values of the artesian water conveying pipeline obtained by the measuring devices at the inlet and the outlet, and calculating the water flow data of the current artesian water conveying pipeline by using a formula.

Preferably, the formula adopted for calculating the water flow data of the artesian water conveying pipeline is Q ═ V × S, the formula V is the artesian water flow velocity, the calculation is performed according to the bernoulli equation or the existing empirical formula, and S is the area of the artesian water when passing through the pipeline.

Preferably, when water flows through the artesian water conveying pipeline, the measuring device can obtain signal combination data detected by the subsurface measuring contact, the liquid level height position h of the water in the artesian water conveying pipeline and the known pipe diameter D of the artesian water conveying pipeline are obtained after binary conversion according to the received signal combination data, and the area S of the artesian water conveying pipeline when the artesian water passes through the pipeline is calculated through a formula:

h is less than D/2	Area S ═	(θ-SinθCosθ)r2	m2
				h is greater than D/2	Area S ═	(π-θ+SinθCosθ)r2	m2

The upper table is a formula of two conditions that the liquid level height h is respectively h < D/2 and h > D/2

Preferably, when the water flow liquid level is less than D/2, the signal collector obtains a signal 'a' of a corresponding monitoring point position, the signal collector transmits the signal to the computing unit c through a modbus protocol, ACSII data are decomposed to obtain a data bit '00000001' of the signal, h of the known average distribution installation measuring point position and the known pipe diameter D of the water pipe can be obtained, the angle number of theta and the known pipe diameter D of the water pipe can be computed according to the height position of each measuring point, and a measuring formula S ═ theta Cos theta (theta-Sin theta) r θ when h is less than D/2 is used²And calculating the water flow area in the artesian water conveying pipeline.

Preferably, when the water flow liquid level exceeds D/2, the signal collector obtains a signal g of a corresponding monitoring point position, the signal collector transmits the signal g to the computing unit c through a modbus protocol, ACSII data are decomposed to obtain a data bit 00001111 of the signal, h of the measuring point position and the known pipe diameter D of the water pipe are installed in known average distribution, an angle number of theta and the known pipe diameter D of the water pipe are computed according to the height position of each measuring point position, and a measuring formula S ═ theta + Sin theta Cos theta) r when h is larger than D/2²And calculating the water flow area in the artesian water conveying pipeline.

(III) advantageous effects

Compared with the prior art, the invention provides a method for measuring the flow of self-flowing water delivery in a pipeline, which has the following beneficial effects:

1. when the measuring method provided by the invention is used, the measuring device adopts the conduction characteristic of safe voltage, signal receiving contact points are uniformly distributed and installed at the inlet and the outlet of a measured pipeline, the liquid level position of the self-flowing water conveying in the pipeline is obtained by combining the number of the measuring contact points and the on-off information of electric signals, the sectional area and the flow of the self-flowing water conveying in the pipeline are calculated by combining the parameters of the diameter size, the roughness, the gradient and the like of the pipeline through a simple formula, and finally the water flow is calculated.

Drawings

FIG. 1 is a schematic diagram illustrating a method for measuring the flow rate of gravity flow water in a pipeline according to the present invention;

FIG. 2 is a schematic diagram of liquid levels in a pipeline where h is less than D/2 and h is greater than D/2 in the method for measuring the flow rate of self-flowing water in the pipeline provided by the invention;

FIG. 3 is a schematic structural diagram of a vertical arrangement of a measuring device in the method for measuring the flow rate of the artesian water in the pipeline according to the present invention;

fig. 4 is a schematic structural diagram of the circumferential arrangement of the measuring device in the method for measuring the flow rate of the artesian water in the pipeline according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

referring to fig. 1-4, a method for measuring the flow of gravity fed water in a pipeline includes the following steps;

step one, assembling a measuring device, acquiring the pipe diameter and the length of a pipeline to be measured, determining the number of contacts to be measured according to the pipe diameter, and then assembling the measuring contacts, wherein the measuring contacts are arranged on an insulating rubber ring;

step two, mounting a measuring device, placing a plurality of assembled measuring contacts at an inlet and an outlet of a pipeline to be measured, and then fixing the measuring device at the inlet and the outlet, and enabling the measuring contacts to face the center of the pipeline;

connecting a point location signal collector, wherein the signal collector is a combination of an RS485 bus circuit board and a power supply module, and cables of the point location signal collector are respectively connected with a plurality of measuring contacts;

step four, associating the sectional area numerical values of the artesian water conveying pipeline obtained by the measuring devices at the inlet and the outlet, calculating the water flow data of the current artesian water conveying pipeline by using a formula, wherein the formula adopted for calculating the water flow data of the artesian water conveying pipeline is Q (V multiplied by S), and the formula V is the flowing speed of the artesian water, calculating according to a Bernoulli equation or an existing empirical formula to calculate S as the area of the artesian water when the artesian water passes through the pipeline, and the empirical formula: "V1/nxR^2/3×I^1/2", wherein:

v is the flow velocity, m/s;

n is the roughness coefficient of the pipe wall, which reflects the roughness of the inner wall of the pipeline;

r-hydraulic radius;

i-the slope of the drain.

When water flows through the artesian water conveying pipeline, the measuring device can obtain signal combination data detected by the measuring contact under the liquid level, the liquid level height position h of the water in the artesian water conveying pipeline and the known pipe diameter D of the artesian water conveying pipeline are obtained after binary conversion according to the received signal combination data, and the area S of artesian water conveying when the artesian water passes through the pipeline is calculated through a formula:

h is less than D/2	Area S ═	(θ-SinθCosθ)r2	m2
				h is greater than D/2	Area S ═	(π-θ+SinθCosθ)r2	m2

The upper table is a formula of two conditions that the liquid level height h is respectively h < D/2 and h > D/2

When the water flow liquid level is less than D/2, the signal collector obtains a signal 'a' of a corresponding monitoring point position, the signal collector is transmitted to a computing unit c through a modbus protocol, ACSII data are decomposed to obtain a data bit '00000001' of the signal, h of the measuring point position and the known pipe diameter D of the water pipe are installed in known average distribution, the angle number of theta and the known pipe diameter D of the water pipe can be computed according to the height position of each measuring point position, and a measuring formula S ═ theta-theta Cos theta (theta-Sin theta) r ═ when h is less than D/2²Calculating the water flow area in the artesian water conveying pipeline;

aqueous liquidWhen the position exceeds D/2, the signal collector obtains a signal g of a corresponding monitoring point position, the signal collector is transmitted to a computing unit c through a modbus protocol, ACSII data are decomposed to obtain a data position 00001111 of the signal, h of the measuring point position and the known pipe diameter D of the water pipe are installed in known average distribution, the angle number of theta and the known pipe diameter D of the water pipe are computed according to the height position of each measuring point position, and a measuring formula S ═ phi-theta + Sin theta Cos theta (theta) r theta when h is larger than D/2²Calculating the water flow area in the artesian water conveying pipeline;

calculating by adopting the following formula according to the error existing in actual measurement;

D÷sX100％＝σ

wherein: d is the pipe diameter, the unit meter, s is the number of mounting points sigma and is the error rate;

for example: a pipe of 1 meter diameter is fitted with an average of 25 measurement points with a calculated error rate of 1 ÷ 25 × 100% ═ 4%.

When the invention is used, the evenly distributed measuring devices are arranged at the inlet and the outlet of the pipeline according to the requirements of pipe diameter and measuring precision, the measuring points of the device are conductive metal bodies, a single measuring contact metal body on the device is divided into two parts, one part is contacted with water flow (or flowing water body), the other part is connected with a weak current signal line and then packaged by using an insulator, other measuring contacts are evenly distributed on the device, the number of the measuring contacts is set according to the precision requirement, the device is divided into a vertical arrangement mode or an extended pipe diameter ring arrangement mode according to the pipe diameter, when flowing water body passes through the pipeline, different weak current signals generated by the evenly distributed measuring contacts are transmitted to a signal collector through a transmission lead, the signal collector simultaneously transmits weak current for the measuring contacts, the liquid level height of the pipeline can be calculated by the signal ASCII combination of point positions, and the sectional area can be calculated by combining with a liquid level area formula, and finally, calculating to obtain the water flow, wherein the method has the characteristics of simple steps, high durability of the device, convenience in equipment manufacture and easiness in maintenance.

It is to be noted that the term "comprises," "comprising," or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.