CN108506740B - Method and system for determining leakage area of liquid pipeline based on flow velocity meter - Google Patents
Method and system for determining leakage area of liquid pipeline based on flow velocity meter Download PDFInfo
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- 239000012530 fluid Substances 0.000 claims description 32
- 238000005259 measurement Methods 0.000 claims description 18
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- 235000020679 tap water Nutrition 0.000 description 16
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- 238000010276 construction Methods 0.000 description 10
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- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
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Abstract
The invention discloses a method and a system for determining a liquid pipeline leakage area based on an anemometer, wherein the method comprises the following steps: determining the pipe diameter and the flow velocity of the liquid pipeline at the installation position of each flow velocity meter; establishing a tree structure related to the flow meter according to the upstream and downstream relations of each liquid pipeline; the tree structure comprises a parent and a child; the father is an anemometer on an upstream liquid pipeline directly connected with the current liquid pipeline; the sub-generation is a flow rate meter on all downstream liquid pipelines connected with the current liquid pipeline; calculating the difference value between the average value of the liquid volume of the current liquid pipeline and the average value of the liquid volume sum of all the downstream liquid pipelines; judging whether the difference is smaller than a set threshold value; and if the leakage is determined not to occur in all the downstream liquid pipelines connected with the current liquid pipeline, otherwise, the leakage occurs. The method or the system provided by the invention allows the pipelines installed by the flowmeter to have branches, so that the application range is expanded, and the efficiency of determining the leakage area of the liquid pipeline is improved.
Description
Technical Field
The invention relates to the technical field of liquid pipeline leakage area determination, in particular to a method and a system for determining a liquid pipeline leakage area based on a flow velocity meter.
Background
When a liquid pipeline (such as a tap water pipe, an oil pipe, etc.) buried underground is damaged, the liquid will leak out, and the liquid will be lost from the damaged portion. In most cases, the loss caused by the leakage of liquid is proportional to the amount of leakage. When a plurality of pipelines are damaged, under the condition of limited repair construction resources, the leakage degree needs to be evaluated, and the repair construction sequence and time schedule are scheduled according to the evaluation result and the operation current condition of the repair construction resources.
Currently, there are two main types of methods for detecting leaks: direct leak detection methods and indirect leak detection methods. The direct leakage detection method is to directly detect a leakage medium by using a detection component (such as a leakage detection cable or an oil sensitive component) preset outside a pipeline, and the method can detect a tiny leakage and can locate the leakage, but requires the installation of the leakage detection component and the pipeline at the same time when the pipeline is constructed. Since the pipeline damage cannot be predicted and the sensing range is limited in such a manner, if a direct leakage detection method is adopted, a large number of detection assemblies must be arranged, which leads to a huge increase in the construction and maintenance costs, and is not suitable for large-area monitoring. The indirect leakage detection method is to deduce the occurrence of leakage by detecting the change of the operating parameters of the pipeline, such as detection signals, pressure, flow rate and the like. The indirect leakage detection method is not as high in sensitivity as the direct leakage detection method, is suitable for detecting larger leakage (about 1 percent generally), has the advantages of being capable of being installed under the condition that production is not affected after pipeline construction, and capable of being continuously upgraded.
In the indirect leakage detection method, an infrasonic wave technology is currently more accurate, the infrasonic wave technology is a novel detection technology which is newly introduced into the field of pipeline leakage detection in China, and the infrasonic wave technology is firstly appeared in the detection fields of typhoon, tsunami, earthquake, volcano, nuclear storm and the like. The infrasonic wave technique is widely used for detection of long-distance outbreak because of its characteristics of long propagation distance and strong penetration ability. The principle of applying the infrasonic wave technology to pipeline leakage detection is to detect the infrasonic wave generated when fluid in a pipe breaks through the restriction of the pipe wall. In practice, the infrasonic wave characteristic is influenced by clutter in the pipe to a minimum extent, the propagation speed is constant, and signals can be transmitted to a far-end receiving unit very clearly, so that favorable conditions are created for accurate position determination. Thus, a detection system incorporating infrasonic techniques can accurately locate the leak location.
The infrasonic wave pipeline leakage detector is an electroacoustic transducer which has dynamic response of a primary meter and can set the measuring range according to the dynamic change of a conveying pipeline. During operation, infrasonic waves generated by transient physical disturbance of the medium caused by leakage of the pipeline are received. The infrasonic wave pipeline leakage detector is installed at the tail end of the pipeline and captures the time difference of the leakage sound waves reaching the infrasonic wave pipeline leakage detector, so that the specific position of a leakage point is calculated. Although the acoustic wave pipeline leakage detector has the capability of accurately measuring the leakage position, the acoustic wave pipeline leakage detector has the problem of high cost, so that the acoustic wave pipeline leakage detector is not suitable for being used for large-range long-term monitoring for measuring the leakage of a tap water pipe.
In order to effectively solve the problem of high cost of system construction and maintenance, flow data measured by a flowmeter is adopted, real-time water flow velocity collected at a water inlet and a water outlet on a water supply pipe at the same time is compared, and if the real-time water flow velocity at the water inlet and the real-time water flow velocity at the water outlet of the water supply pipe are equal, the water supply of the water supply pipe is judged to be normal; if the real-time water flow velocity at the water inlet of the water supply pipe is larger than that at the water outlet, the water leakage accident of the water supply pipe is judged, and the damaged water supply pipe is found out in the mode. This approach, while reducing the cost of system deployment and maintenance, requires that the water line in which the flow meter is installed not be branched.
Disclosure of Invention
The invention aims to provide a method and a system for determining a liquid pipeline leakage area based on a flow velocity meter, which allow branches to be arranged between pipelines on which the flow meter is installed, reduce the system construction and maintenance cost, expand the application range and improve the efficiency of determining the liquid pipeline leakage area.
In order to achieve the purpose, the invention provides the following scheme:
a method for determining a liquid pipeline leakage area based on an anemometer comprises the following steps:
determining the pipe diameter of a liquid pipeline at the installation position of each flow meter; wherein at least one of said flow meters is mounted on each of said liquid conduits;
periodically acquiring the flow rate of the liquid pipeline at the installation position of each flow meter;
establishing a tree structure related to the flow velocity meter according to the upstream and downstream relations of each liquid pipeline; the tree structure comprises a parent and a child; the father is an anemometer on an upstream liquid pipeline directly connected with the current liquid pipeline; the sub generation is a flow rate meter on all downstream liquid pipelines connected with the current liquid pipeline;
calculating a first average value and a second average value according to the flow rate and the pipe diameter corresponding to the current liquid pipeline and the flow rate and the pipe diameter corresponding to all the downstream liquid pipelines in a period; the first average value represents an average value of the liquid volume of the current liquid pipeline; the second average value represents an average of the liquid volume sum of all the downstream liquid conduits;
judging whether the difference value of the first average value and the second average value is smaller than a set threshold value or not to obtain a first judgment result;
if the first judgment result shows that the difference value is smaller than the set threshold value, determining that all the downstream liquid pipelines connected with the current liquid pipeline are not leaked;
and if the first judgment result shows that the difference value is greater than or equal to the set threshold value, determining that the downstream liquid pipeline connected with the current liquid pipeline leaks.
Optionally, after determining that the downstream liquid pipeline connected to the current liquid pipeline has a leakage, the method for determining the leakage area of the liquid pipeline further includes: determining a leak level of the downstream fluid line connected to the current fluid line.
Optionally, the determining the leakage level of the downstream liquid pipeline connected to the current liquid pipeline specifically includes:
determining a first difference threshold and a second difference threshold; wherein the first discrimination threshold is less than the second discrimination threshold;
calculating a leakage ratio;
comparing the leakage ratio value with the first difference threshold value and the second difference threshold value respectively to determine a comparison result;
determining the leak level as a light leak when the comparison result indicates that the leak ratio is less than or equal to the first discrimination threshold;
determining the leak level as a medium leak when the comparison indicates that the leak ratio is greater than the first discrimination threshold and less than the second discrimination threshold;
determining the leak level as a heavy leak when the comparison indicates that the leak ratio is greater than or equal to the second discrimination threshold.
Optionally, the calculating the leakage ratio specifically includes:
calculating a leakage ratio according to the following formula; the formula is:wherein L isiRepresents the leak ratio; m represents the measurement in periodThe number of times of measurement, the time points of m measurements are t1，t2，…，tm；
i denotes the current liquid line, AiIndicating the current pipe diameter of the liquid pipe, VijIs shown at a point in time tjThe current flow rate of the liquid pipeline; skDenotes an anemometer on the kth downstream liquid line, C (S)i) A child representing an anemometer on the current fluid line; a. thekDenotes the pipe diameter, V, of the kth downstream fluid linekjIs shown at a point in time tjThe flow rate of the kth downstream liquid line.
Optionally, calculating a difference between the first average value and the second average value according to the following formula; the formula is:
The invention also provides a liquid pipeline leakage area determining system based on the flow velocity meter, which comprises the following components:
the pipe diameter determining module is used for determining the pipe diameter of the liquid pipeline at the installation position of each flow meter; wherein at least one of said flow meters is mounted on each of said liquid conduits;
the flow rate acquisition module is used for periodically acquiring the flow rate of the liquid pipeline at the installation position of each flow rate meter;
the tree structure establishing module is used for establishing a tree structure related to the flow meter according to the upstream and downstream relation of each liquid pipeline; the tree structure comprises a parent and a child; the father is an anemometer on an upstream liquid pipeline directly connected with the current liquid pipeline; the sub generation is a flow rate meter on all downstream liquid pipelines connected with the current liquid pipeline;
the liquid volume average value calculating module is used for calculating a first average value and a second average value according to the flow rate and the pipe diameter corresponding to the current liquid pipeline and the flow rate and the pipe diameter corresponding to all the downstream liquid pipelines in a period; the first average value represents an average value of the liquid volume of the current liquid pipeline; the second average value represents an average of the liquid volume sum of all the downstream liquid conduits;
a first judgment result obtaining module, configured to judge whether a difference between the first average value and the second average value is smaller than a set threshold, so as to obtain a first judgment result;
a liquid pipeline no-leakage determining module, configured to determine that all downstream liquid pipelines connected to the current liquid pipeline have no leakage when the first determination result indicates that the difference is smaller than the set threshold;
and the liquid pipeline leakage determining module is used for determining that the downstream liquid pipeline connected with the current liquid pipeline leaks when the first judgment result shows that the difference value is greater than or equal to the set threshold value.
Optionally, the system for determining a leakage area of the liquid pipeline further includes: a leakage level determination module;
the leakage level determination module is configured to determine a leakage level of the downstream fluid line connected to the current fluid line.
Optionally, the leakage level determining module specifically includes:
a discrimination threshold determining unit configured to determine a first discrimination threshold and a second discrimination threshold; wherein the first discrimination threshold is less than the second discrimination threshold;
a leakage ratio calculation unit for calculating a leakage ratio; the calculation formula of the leakage ratio is as follows:
wherein L isiRepresents the leak ratio; m represents the period ofThe number of measurements, the time points of m measurements are t1，t2，…，tm；
i denotes the current liquid line, AiIndicating the current pipe diameter of the liquid pipe, VijIs shown at a point in time tjThe current flow rate of the liquid pipeline; skDenotes an anemometer on the kth downstream liquid line, C (S)i) A child representing an anemometer on the current fluid line; a. thekDenotes the pipe diameter, V, of the kth downstream fluid linekjIs shown at a point in time tjThe flow rate of the kth downstream liquid line;
a comparison result determination unit configured to compare the leak ratio with the first discrimination threshold and the second discrimination threshold, respectively, and determine a comparison result;
a light leakage determining unit for determining the leakage level as light leakage when the comparison result indicates that the leakage ratio is less than or equal to the first discrimination threshold;
an intermediate leakage determining unit configured to determine the leakage level as an intermediate leakage when the comparison result indicates that the leakage ratio is greater than the first discrimination threshold and less than the second discrimination threshold;
a severe leakage determining unit for determining the leakage level as a severe leakage when the comparison result indicates that the leakage ratio is greater than or equal to the second discrimination threshold.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a method and a system for determining a liquid pipeline leakage area based on an anemometer, wherein the method comprises the following steps: determining the pipe diameter of a liquid pipeline at the installation position of each flow meter; wherein at least one flow meter is mounted on each liquid pipe; periodically acquiring the flow velocity of the liquid pipeline at the installation position of each flow velocity meter; establishing a tree structure related to the flow meter according to the upstream and downstream relations of each liquid pipeline; the tree structure comprises a parent and a child; the father is an anemometer on an upstream liquid pipeline directly connected with the current liquid pipeline; the sub-generation is a flow rate meter on all downstream liquid pipelines connected with the current liquid pipeline; calculating a first average value and a second average value according to the flow rate and the pipe diameter corresponding to the current liquid pipeline and the flow rates and the pipe diameters corresponding to all downstream liquid pipelines in a period; the first average value represents an average value of the liquid volume of the current liquid pipeline; the second average represents the average of the liquid volume sum of all downstream liquid conduits; judging whether the difference value of the first average value and the second average value is smaller than a set threshold value or not; if yes, determining that all downstream liquid pipelines connected with the current liquid pipeline are not leaked; if not, determining that the downstream liquid pipeline connected with the current liquid pipeline leaks. Therefore, the method or the system provided by the invention allows the pipelines in which the flowmeter is installed to be provided with branches, reduces the system construction and maintenance cost, enlarges the application range and improves the efficiency of determining the leakage area of the liquid pipeline.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic flow chart illustrating a method for determining a leakage area of a liquid pipeline according to an embodiment of the present invention;
FIG. 2 is a schematic view of a flow meter of the present invention deployed in a tap water pipeline;
FIG. 3 is an architectural diagram of the system for monitoring leakage from a mains water pipeline according to the present invention;
FIG. 4 is a tree structure diagram corresponding to the distribution of the flow rate meter according to the present invention;
FIG. 5 is a schematic explanatory view of a method for determining a leakage area of a water pipe according to the present invention;
FIG. 6 is a schematic view showing the degree of leakage in various regions of a water supply line according to the present invention;
fig. 7 is a schematic structural diagram of a system for determining a leakage area of a liquid pipeline according to an embodiment of 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.
The invention aims to provide a method and a system for determining a liquid pipeline leakage area based on a flow velocity meter, which allow branches to be arranged between pipelines on which the flow meter is installed, reduce the system construction and maintenance cost, expand the application range and improve the efficiency of determining the liquid pipeline leakage area.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention adopts the low-cost flow velocity meter to improve the cost problem, but because the flow velocity meter does not have the capability of measuring the damaged position and the leakage degree of the liquid pipeline, a matched method is required to solve the problem.
The method provided by the invention determines the damage position and the leakage degree through the flow speed data in the liquid pipeline and the liquid pipeline structure measured by the flow speed meter, and sends the determination result to the pipeline maintenance unit as the basis for scheduling the sequence and the time course of the repair construction.
Fig. 1 is a schematic flow chart of a method for determining a leakage area of a liquid pipeline according to an embodiment of the present invention, and as shown in fig. 1, the method for determining a leakage area of a liquid pipeline according to an embodiment of the present invention specifically includes the following steps:
step 101: determining the pipe diameter of a liquid pipeline at the installation position of each flow meter; wherein at least one of the flow meters is installed on each of the liquid pipes.
Step 102: periodically obtaining the flow rate of the liquid pipeline at the installation position of each flow rate meter.
Step 103: establishing a tree structure related to the flow velocity meter according to the upstream and downstream relations of each liquid pipeline; the tree structure comprises a parent and a child; the father is an anemometer on an upstream liquid pipeline directly connected with the current liquid pipeline; the sub generation is a flow rate meter on all downstream liquid pipelines connected with the current liquid pipeline.
Step 104: calculating a first average value and a second average value according to the flow rate and the pipe diameter corresponding to the current liquid pipeline and the flow rate and the pipe diameter corresponding to all the downstream liquid pipelines in a period; the first average value represents an average value of the liquid volume of the current liquid pipeline; the second average value represents an average of the liquid volume sum of all the downstream liquid conduits.
Step 105: judging whether the difference value of the first average value and the second average value is smaller than a set threshold value or not to obtain a first judgment result; if the first determination result indicates that the difference is smaller than the set threshold, execute step 106; if the first determination result indicates that the difference is greater than or equal to the set threshold, step 107 is performed.
Step 106: determining that no leak has occurred in all of the downstream fluid lines connected to the current fluid line.
Step 107: determining that the downstream fluid line connected to the current fluid line is leaking.
Step 108: determining a leak level of the downstream fluid line connected to the current fluid line.
Step 108 specifically includes:
determining a first difference threshold and a second difference threshold; wherein the first discrimination threshold is less than the second discrimination threshold.
Calculating a leakage ratio; the calculation formula of the leakage ratio is as follows:
wherein L isiRepresents the leak ratio; m represents the period ofThe number of measurements, the time points of m measurements are t1，t2，…，tm；
i denotes the current liquid line, AiIndicating the current pipe diameter of the liquid pipe, VijIs shown at a point in time tjThe current flow rate of the liquid pipeline; skDenotes an anemometer on the kth downstream liquid line, C (S)i) A child representing an anemometer on the current fluid line; a. thekDenotes the pipe diameter, V, of the kth downstream fluid linekjIs shown at a point in time tjThe flow rate of the kth downstream liquid line.
And comparing the leakage ratio with the first distinguishing threshold and the second distinguishing threshold respectively to determine a comparison result.
Determining the leak level as a light leak when the comparison result indicates that the leak ratio is less than or equal to the first discrimination threshold.
Determining the leak level as a medium leak when the comparison indicates that the leak ratio is greater than the first discrimination threshold and less than the second discrimination threshold.
Determining the leak level as a heavy leak when the comparison indicates that the leak ratio is greater than or equal to the second discrimination threshold.
Wherein the formula for calculating the difference between the first average value and the second average value is:
The method for determining the leakage area of a liquid pipeline based on a flow rate meter and the method for evaluating the leakage degree of the liquid pipeline according to the present invention will be described below by taking a tap water pipe as an example.
FIG. 2 is a schematic view of a flow meter of the present invention installed in a tap water pipe.
As shown in fig. 2, the dark circle is marked with SiIs an anemometer arranged on a tap water pipeline. The requirement for deployment is that at least one flow meter must be installed for each mains water pipe.
FIG. 3 is an architectural diagram of the system for monitoring leakage from a mains water pipeline according to the present invention.
As shown in fig. 3, all the flow meters periodically upload the flow rate of the tap water pipeline measured by the flow meters to the cloud system. Because the flow rate meter is generally installed in an outdoor area, the network between the flow rate meter and the cloud system is a wireless network maintained by an operator such as GSM/GPRS/3G/4G/NB-IoT/LoRa. In order to determine the leakage area and the leakage range, the position of the velocity meter and the tree structure formed by the upstream and downstream relationship of the velocity meter are stored in a flow monitoring cloud platform for monitoring the tap water pipeline leakage system.
In order to effectively illustrate the proposed method of the invention, the following definitions of the symbols are specified:
the flowmeter is installed at proper position of water supply pipeline, and the main outlet pipeline of same liquid supply plant and all the flowmeters installed on the water supply pipeline extended from it are respectively S0，S1，…，SnAnd (4) showing.
Flow velocity meter SiThe pipe diameter of the tap water pipeline at the installation position is Ai。
At a point in time tjTime current meter SiThe measured flow velocity of the tap water pipe is Vij。
According to these flow meters S0，S1，…，SnIs constructed as a Sensor Tree, an anemometer S0Is the root of the sensor tree, and is the odometer mounted on the main outlet pipe of the liquid supply plant.
The tree structure corresponding to the flow rate meter distribution method is shown in FIG. 4 according to the above symbol definitions.
In the same period of time (t) without the liquid in the mains changing viscosity (e.g. icing, etc.) and leaking due to pipe breakagej，tj+ Δ t), flows through the flowmeter SiShould be equal to the expected value of the liquid flow through the meter C (S) during the periodi) Is desired for the sum of the liquid flow rates. If at the flowmeter SiAnd a current meter C (S)i) When the pipeline is damaged and leaks, the same time interval (t) is adoptedj，tj+ Δ t), flows through the flowmeter SiShould be greater than the expected value of the liquid flow through the meter C (S) during that periodi) Is desired for the sum of the liquid flow rates.
Fig. 5 is a schematic explanatory view of a method for determining a leakage area of a fluid piping according to the present invention.
As shown in fig. 5, if on the flow meter SiWith all flow meters C (S)i) Under the condition that the tap water pipeline between the two flow meters is not leaked, the flow meter S flows through in the same time period based on the mass conservation theoremiShould be equal to the volume of liquid flowing through the meter C (S)i) The sum of the liquid volumes of (a). Since the liquid pressure at each position in the pipe may change suddenly due to the leakage of the liquid in the actual measurement, the liquid sometimes flows through the flow meter S at the time point of the measurementiDoes not equal the flow rate of the liquid passing through the meter C (S) during the periodi) The sum of the liquid flow rates of (a). Although not necessarily exactly the same, the expected values for the two should be the same, i.e. if there are multiple measurements, then the flow meter S is passed through, since there is no new liquid addition or leakage in this interval, based on the principle of conservation of massiShould be closer and closer to the average value of the liquid volume flowing through the flowmeter C (S)i) Average of the sum of the liquid volumes of (a).
If at the flow meter SiTo all flow ratesMeter C (S)i) The liquid leakage occurs in the liquid pipe between the two, and the leaked liquid does not flow through the flow meter C (S)i) Any of the flow meters, and thus flows through SiShould be greater than the average volume of liquid flowing through the meter C (S)i) Average of the sum of the liquid volumes of (a).
Based on the above description, the following conclusions were drawn:
conclusion 1: if at the flow meter SiWith all flow meters C (S)i) The tap water pipeline between the water pipes has no leakage, then
Wherein E (X) represents the average value of the random variable X.
Conclusion 2: if at the flow meter SiWith all flow meters C (S)i) When the tap water pipe between the two pipes leaks
If the degree of leakage is more severe, then
The larger will be.
Based on conclusion 1 and conclusion 2, the present invention provides the following method for determining the leakage area of the tap water pipeline and evaluating the leakage degree thereof, comprising the following steps:
the first step is as follows: the flow rates of all the flow meters were measured periodically and recorded in a system for monitoring tap water pipe leaks.
The second step is that: the data of the last m measurements are read out for comparison analysis (assuming that the time points of the m measurements are t1，t2，…，tm)；
For the current meter SiAnd time tjCalculating
Then calculate
Flow meter SiAnd a flowmeter SkWater leakage degree and LiIs proportional to the value of (c). If L isiThe larger the value of (c), the more the time period (t) is1，tm) Middle, flow meter SiAnd a flowmeter SkThe more serious the water leakage degree is; if L isiClose to 0, indicates that in time period (t)1，tm) Middle, flow meter SiAnd a flowmeter SkThe water leakage degree is very slight or even no, wherein Sk∈C(Si)。
FIG. 6 is a schematic view showing the degree of leakage in each region of the water supply line according to L in FIG. 6iThe leakage area and the leakage degree of each area of the tap water pipeline are determined.
In order to achieve the aim, the invention also provides a liquid pipeline leakage area determining system based on the flow velocity meter.
Fig. 7 is a schematic structural diagram of a liquid pipeline leakage area determining system according to an embodiment of the present invention, and as shown in fig. 7, the liquid pipeline leakage area determining system according to the embodiment of the present invention includes:
a pipe diameter determining module 100, configured to determine pipe diameters of liquid pipes at installation positions of the flow meters; wherein at least one of said flow meters is mounted on each of said liquid conduits;
a flow rate obtaining module 200, configured to periodically obtain a flow rate of the liquid pipeline at which each of the flow meters is installed;
a tree structure establishing module 300, configured to establish a tree structure about the flow meter according to an upstream-downstream relationship of each of the liquid pipelines; the tree structure comprises a parent and a child; the father is an anemometer on an upstream liquid pipeline directly connected with the current liquid pipeline; the sub generation is a flow rate meter on all downstream liquid pipelines connected with the current liquid pipeline;
a liquid volume average value calculating module 400, configured to calculate a first average value and a second average value according to a flow rate and a pipe diameter corresponding to the current liquid pipeline and flow rates and pipe diameters corresponding to all the downstream liquid pipelines in a period; the first average value represents an average value of the liquid volume of the current liquid pipeline; the second average value represents an average of the liquid volume sum of all the downstream liquid conduits;
a first determination result obtaining module 500, configured to determine whether a difference between the first average value and the second average value is smaller than a set threshold, so as to obtain a first determination result;
a liquid pipeline no-leakage determining module 600, configured to determine that all the downstream liquid pipelines connected to the current liquid pipeline have no leakage when the first determination result indicates that the difference is smaller than the set threshold;
a liquid pipeline leakage determining module 700, configured to determine that the downstream liquid pipeline connected to the current liquid pipeline leaks when the first determination result indicates that the difference is greater than or equal to the set threshold.
A leak level determination module 800 for determining a leak level of the downstream fluid line connected to the current fluid line.
The leakage level determining module 800 specifically includes:
a discrimination threshold determining unit configured to determine a first discrimination threshold and a second discrimination threshold; wherein the first discrimination threshold is less than the second discrimination threshold.
A leakage ratio calculation unit for calculating a leakage ratio; the calculation formula of the leakage ratio is as follows:
wherein L isiRepresents the leak ratio; m represents the number of measurements in a period, and the time points of the m measurements are respectively t1，t2，…，tm；
i denotes the current liquid line, AiIndicating the current pipe diameter of the liquid pipe, VijIs shown at a point in time tjThe current flow rate of the liquid pipeline; skDenotes an anemometer on the kth downstream liquid line, C (S)i) A child representing an anemometer on the current fluid line; a. thekDenotes the pipe diameter, V, of the kth downstream fluid linekjIs shown at a point in time tjThe flow rate of the kth downstream liquid line.
A comparison result determination unit configured to compare the leakage ratio with the first discrimination threshold and the second discrimination threshold, respectively, and determine a comparison result.
A light leakage determining unit for determining the leakage level as light leakage when the comparison result indicates that the leakage ratio is less than or equal to the first discrimination threshold.
An intermediate leakage determining unit configured to determine the leakage level as intermediate leakage when the comparison result indicates that the leakage ratio is greater than the first discrimination threshold and less than the second discrimination threshold.
A severe leakage determining unit for determining the leakage level as a severe leakage when the comparison result indicates that the leakage ratio is greater than or equal to the second discrimination threshold.
The invention provides a method for simultaneously measuring a liquid leakage area only by a flow velocity meter. The method allows the pipelines in which the flow meters are installed to be provided with branches, greatly reduces the number of the flow meters required to be arranged, greatly reduces the arrangement and maintenance cost of the system, and enlarges the application range. In addition, a single and wide-range number can be obtained for each area in the liquid pipeline as an index of the water leakage degree, the index can be used as a basis for scheduling operation of a maintenance unit for the pipeline leakage for maintenance work, and a method for determining the pipeline leakage degree is provided, so that the maintenance scheduling sequence can be effectively and accurately determined by the pipeline maintenance unit.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (3)
1. A method for determining a liquid pipeline leakage area based on an anemometer is characterized by comprising the following steps:
determining the pipe diameter of a liquid pipeline at the installation position of each flow meter; wherein at least one of said flow meters is mounted on each of said liquid conduits;
periodically acquiring the flow rate of the liquid pipeline at the installation position of each flow meter;
establishing a tree structure related to the flow velocity meter according to the upstream and downstream relations of each liquid pipeline; the tree structure comprises a parent and a child; the father is an anemometer on an upstream liquid pipeline directly connected with the current liquid pipeline; the sub generation is a flow rate meter on all downstream liquid pipelines connected with the current liquid pipeline;
calculating a first average value and a second average value according to the flow rate and the pipe diameter corresponding to the current liquid pipeline and the flow rate and the pipe diameter corresponding to all the downstream liquid pipelines in a period; the first average value represents an average value of the liquid volume of the current liquid pipeline; the second average value represents an average of the liquid volume sum of all the downstream liquid conduits;
judging whether the difference value of the first average value and the second average value is smaller than a set threshold value or not to obtain a first judgment result;
if the first judgment result shows that the difference value is smaller than the set threshold value, determining that all the downstream liquid pipelines connected with the current liquid pipeline are not leaked;
if the first judgment result shows that the difference value is larger than or equal to the set threshold value, determining that the downstream liquid pipeline connected with the current liquid pipeline leaks;
determining a leak level of the downstream fluid line connected to the current fluid line; the method specifically comprises the following steps: determining a first difference threshold and a second difference threshold; wherein the first discrimination threshold is less than the second discrimination threshold;
calculating a leakage ratio; wherein, the leakage ratio value calculation formula is as follows:
wherein L isiRepresents the leak ratio; m represents the number of measurements in a period, and the time points of the m measurements are respectively t1，t2，…，tm；
i denotes the current liquid line, AiIndicating the current pipe diameter of the liquid pipe, VijIs shown at a point in time tjThe current flow rate of the liquid pipeline; skDenotes an anemometer on the kth downstream liquid line, C (S)i) A child representing an anemometer on the current fluid line; a. thekDenotes the pipe diameter, V, of the kth downstream fluid linekjIs shown at a point in time tjThe flow rate of the kth downstream liquid line;
comparing the leakage ratio value with the first difference threshold value and the second difference threshold value respectively to determine a comparison result;
determining the leak level as a light leak when the comparison result indicates that the leak ratio is less than or equal to the first discrimination threshold;
determining the leak level as a medium leak when the comparison indicates that the leak ratio is greater than the first discrimination threshold and less than the second discrimination threshold;
determining the leak level as a heavy leak when the comparison indicates that the leak ratio is greater than or equal to the second discrimination threshold.
2. The method of determining a liquid piping leakage area according to claim 1, wherein a difference between the first average value and the second average value is calculated according to the following formula; the formula is:
wherein Δ represents a difference; e (A)iVij) Representing a first average value;
representing the second average.
3. A fluid line leak area determination system based on an anemometer, the fluid line leak area determination system comprising:
the pipe diameter determining module is used for determining the pipe diameter of the liquid pipeline at the installation position of each flow meter; wherein at least one of said flow meters is mounted on each of said liquid conduits;
the flow rate acquisition module is used for periodically acquiring the flow rate of the liquid pipeline at the installation position of each flow rate meter;
the tree structure establishing module is used for establishing a tree structure related to the flow meter according to the upstream and downstream relation of each liquid pipeline; the tree structure comprises a parent and a child; the father is an anemometer on an upstream liquid pipeline directly connected with the current liquid pipeline; the sub generation is a flow rate meter on all downstream liquid pipelines connected with the current liquid pipeline;
the liquid volume average value calculating module is used for calculating a first average value and a second average value according to the flow rate and the pipe diameter corresponding to the current liquid pipeline and the flow rate and the pipe diameter corresponding to all the downstream liquid pipelines in a period; the first average value represents an average value of the liquid volume of the current liquid pipeline; the second average value represents an average of the liquid volume sum of all the downstream liquid conduits;
a first judgment result obtaining module, configured to judge whether a difference between the first average value and the second average value is smaller than a set threshold, so as to obtain a first judgment result;
a liquid pipeline no-leakage determining module, configured to determine that all downstream liquid pipelines connected to the current liquid pipeline have no leakage when the first determination result indicates that the difference is smaller than the set threshold;
a liquid pipeline leakage determining module, configured to determine that the downstream liquid pipeline connected to the current liquid pipeline leaks when the first determination result indicates that the difference is greater than or equal to the set threshold;
a leakage level determination module for determining a leakage level of the downstream fluid line connected to the current fluid line; the method specifically comprises the following steps:
a discrimination threshold determining unit configured to determine a first discrimination threshold and a second discrimination threshold; wherein the first discrimination threshold is less than the second discrimination threshold;
a leakage ratio calculation unit for calculating a leakage ratio; the calculation formula of the leakage ratio is as follows:
wherein L isiRepresents the leak ratio; m represents the number of measurements in a period, and the time points of the m measurements are respectively t1，t2，…，tm；
i denotes the current liquid line, AiIndicating the current pipe diameter of the liquid pipe, VijIs shown at a point in time tjThe current flow rate of the liquid pipeline; skDenotes an anemometer on the kth downstream liquid line, C (S)i) A child representing an anemometer on the current fluid line; a. thekDenotes the pipe diameter, V, of the kth downstream fluid linekjIs shown at a point in time tjThe flow rate of the kth downstream liquid line;
a comparison result determination unit configured to compare the leak ratio with the first discrimination threshold and the second discrimination threshold, respectively, and determine a comparison result;
a light leakage determining unit for determining the leakage level as light leakage when the comparison result indicates that the leakage ratio is less than or equal to the first discrimination threshold;
an intermediate leakage determining unit configured to determine the leakage level as an intermediate leakage when the comparison result indicates that the leakage ratio is greater than the first discrimination threshold and less than the second discrimination threshold;
a severe leakage determining unit for determining the leakage level as a severe leakage when the comparison result indicates that the leakage ratio is greater than or equal to the second discrimination threshold.
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| CN109780451B (en) * | 2018-12-20 | 2021-01-05 | 国电大渡河沙坪水电建设有限公司 | Power plant speed regulator oil circuit inspection method based on machine vision |
| DE102020107780A1 (en) * | 2020-03-20 | 2021-09-23 | Grohe Ag | Method for monitoring a water supply network, water supply network and fault detection system |
| CN112145977A (en) * | 2020-09-16 | 2020-12-29 | 重庆元图位联科技有限公司 | Underground pipe network gas dangerous source monitoring and early warning system |
| CN112700625B (en) * | 2021-03-25 | 2021-06-25 | 椭圆方程（深圳）信息技术有限公司 | BIM-based water leakage alarm positioning method, device and equipment |
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