CN113390583A - Water leakage detection method for water meter, water supply system and application method - Google Patents
Water leakage detection method for water meter, water supply system and application method Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 434
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/003—Arrangement for testing of watertightness of water supply conduits
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons, valves, in the pipe systems
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons, valves, in the pipe systems
- E03B7/072—Arrangement of flowmeters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
Abstract
The invention discloses a water leakage detection method for a water meter, the water meter, a water supply system and an application method, wherein the water leakage detection method comprises the following steps: acquiring a flow velocity-time curve of the water meter, searching for a rising edge and a falling edge of the flow velocity, and rejecting a flow velocity signal between the starting time of the rising edge and the ending time of the falling edge of the flow velocity to obtain a filtered flow velocity-time curve; if the instantaneous value of the flow rate at a specified moment in the flow rate-time curve exceeds a first preset threshold value or the average value of the flow rate at a specified time interval exceeds a second preset threshold value, judging that the water leakage problem exists at the tail end of the water meter; the water meter is a water pump corresponding to the method, the water supply system comprises a main water pipe and a plurality of water distribution pipes connected to the main water pipe in parallel, the main water pipe is provided with a plurality of main water meters, and each water distribution pipe is provided with one water distribution meter. The invention can eliminate the interference of various normal water consumption on water leakage detection, realizes accurate water leakage detection, and has the advantages of high detection accuracy and convenient implementation.
Description
Technical Field
The invention relates to a water leakage detection method for a water meter, the water meter, a water supply system and an application method.
Background
According to public information display of a department of housing and construction, in 2019, the average leakage rate of tap water networks in cities in China is about 13.2%, the water leakage amount of city water supply is 83.54 billion cubic meters, and waste is huge. The high leakage rate is caused by aging of the pipeline or damage to the pipeline due to geological settlement. In order to reduce the leakage rate, people adopt a plurality of methods to detect the leakage of the pipeline, and the existing leakage detection method is to excavate and repair maintenance personnel when waiting for serious consequences caused by the leakage; or a leak detector monitors the leakage along the ground above the water pipe by using a sound receiver when the person is quiet at night, the method has low efficiency, and the leakage cannot be systematically monitored in a large area. In addition, in recent years, an infrasonic wave sensor is mounted on the outer wall of a pipe network to monitor leakage, but infrasonic wave signals generated by leakage are close to the frequency of noise such as road traffic in the environment, and are easy to interfere with normal signals.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems in the prior art, the invention provides the water leakage detection method for the water meter, the water supply system and the application method.
In order to solve the technical problems, the invention adopts the technical scheme that:
a water leakage detection method for a water meter comprises the following steps:
1) acquiring a flow speed-time curve of the water meter;
2) searching the rising edge and the falling edge of the flow velocity in the flow velocity-time curve, and rejecting flow velocity signals between the starting time of the rising edge and the ending time of the falling edge of the flow velocity to obtain a filtered flow velocity-time curve;
3) and aiming at the filtered flow speed-time curve, if the instantaneous value of the flow speed at a specified moment exceeds a first preset threshold value or the average value of the flow speed at a specified time interval exceeds a second preset threshold value, judging that the water leakage problem exists at the tail end of the water meter.
Optionally, when the rising edge and the falling edge of the flow rate are searched in the flow rate-time curve in step 2), the rising edge and the falling edge refer to that the straight line segment is determined to be the rising edge by performing piecewise straight line fitting on the flow rate-time curve, and if the slope range of a certain straight line segment obtained by fitting falls between (0,90 °); and if the slope range of a certain straight line segment obtained by fitting falls between-90 degrees and 0), judging the straight line segment as a falling edge.
Optionally, when the rising edge and the falling edge of the flow rate are searched in the flow rate-time curve in step 2), if a plurality of continuous rising edges are found, the plurality of continuous rising edges are combined into one rising edge; if a plurality of continuous falling edges are found, combining the plurality of continuous falling edges into one falling edge; if the first found falling edge is found when the rising edge and the falling edge of the flow speed are found, the starting moment is taken as the rising edge; if the last found rising edge is found when the rising edge and the falling edge of the flow speed are found, the ending moment is taken as the falling edge.
Optionally, the step 2) further includes detecting a time difference between adjacent rising edges and falling edges, and if the time difference exceeds a third preset threshold, determining that a water leakage problem exists at the tail end of the water meter; after the flow velocity signals in the middle of the rising edge and the falling edge of the flow velocity are removed in the step 2), the method further comprises the step of supplementing the flow velocity data at any time between the starting time of the rising edge and the ending time of the falling edge through interpolation.
In addition, the invention also provides a water meter with a water leakage detection function, which comprises a microprocessor and a sensor for detecting the flow or the flow rate of the water meter, wherein the microprocessor and the sensor are connected with each other, and the microprocessor is programmed or configured to execute the steps of the water leakage detection method for the water meter.
In addition, the invention also provides a water supply system, which comprises a main water pipe and a plurality of branch water pipes connected to the main water pipe in parallel, wherein a plurality of main water meters are arranged on the main water pipe, each branch water pipe is provided with one branch water meter, the main water meters correspond to the branch water pipes one by one, each main water meter is arranged at the upstream of the junction point where the corresponding branch water pipe is connected into the main water pipe, and part or all of the main water meters and the branch water meters are water meters with the water leakage detection function.
Optionally, the water supply system further comprises a control device, a secondary water supply pump and a reservoir for supplying water to the water load of the water distribution pipe are sequentially connected in series to part or all of the water distribution pipes, the control end of the secondary water supply pump is connected with the control device, and the main water meter and the water distribution meter are respectively connected with the control device through a wired cable or a wireless network.
In addition, the invention also provides an application method of the water supply system, which comprises the following steps of executing water leakage detection of a water distribution pipe junction:
s1) collecting the flow of the main water meter and the branch water meters;
s2) aiming at the confluence point of each branch pipe connected to the main water pipe, firstly, calculating the sum of the flow of the main water meter adjacent to the downstream of the confluence point and the flow of the branch water meters on each confluent pipe as the downstream total flow of the confluence point, then judging whether the flow of the main water meter adjacent to the upstream of the confluence point is equal to the downstream total flow of the confluence point within a specified time period, and if so, judging that the water leakage problem exists between the confluence point and the adjacent main water meter or the branch water meters;
the method also comprises the step of executing pipeline water leakage detection between the sub water meter and the reservoir: recording the starting time t of each automatic starting of the secondary water supply pump at the lowest water level1And a stop time t of automatic stop after reaching the highest water level2The starting time t is obtained after the secondary water supply pump is automatically stopped each time after the reservoir reaches the highest water level1Stop time t2Time period Δ t in between1Flow Q of upper water meter of internal corresponding water distribution pipe1If the flow rate Q1If the difference value between the water diversion meter and the preset calibration value delta Q is larger than a fourth preset threshold value, judging that the pipeline between the water diversion meter and the corresponding reservoir has the water leakage problem; wherein, the preset calibration value delta Q is the capacity difference of the reservoir between the highest water level and the lowest water level.
Optionally, the method further includes counting the flow rates of the main water meter close to the water inlet end of the main water pipe in each time period in the designated period, and controlling the working state of the main water pump for supplying water to the main water pipe in each time period in the designated period according to the flow rates, so that the water pressure in the main water pipe in each time period in the designated period is positively correlated with the flow rate in the time period.
Optionally, the control device is used for controlling the water consumption to be twice in a preset time period of the non-frequent water consumptionThe method comprises the following steps of optimally controlling a water supply pump: at the beginning time t of entering a preset time period of non-frequent water consumption3Then, firstly, based on the historical data of the upper water meter of the corresponding water distribution pipe, the stop time t of the last secondary water supply pump for automatically stopping after the water storage tank reaches the highest water level is obtained2Start time t3The average flow or the maximum flow of the water load on the intermediate water distribution pipe is recorded as the required flow Q2Then the water reservoir reaches the maximum water storage quantity Q of the highest water level3Minus the demanded flow Q2Obtaining the initial water storage quantity Q of the reservoir entering the preset time period of the infrequent water consumption4If the initial water storage capacity Q4Less than a predetermined amount of infrequent water Q5Then according to the initial water storage quantity Q4Non-frequent water consumption Q5The difference starts a secondary water supply pump to increase the water storage quantity of the reservoir to the non-frequent water consumption Q5Then shielding the automatic execution control strategy of automatic start of the lowest water level and automatic stop of the highest water level of the secondary water supply pump, and replying the automatic execution control strategy of automatic start of the lowest water level and automatic stop of the highest water level of the secondary water supply pump at the end of the preset non-frequent water consumption time period; the amount of said infrequent water used Q5The water consumption upper limit of the preset time period of the non-frequent water consumption.
Compared with the prior art, the invention has the following advantages:
1. the water leakage detection method comprises the steps of searching the rising edge and the falling edge of the flow velocity in the flow velocity-time curve, removing flow velocity signals in the middle of the rising edge and the falling edge of the flow velocity to obtain the filtered flow velocity-time curve, and then carrying out water leakage detection based on the filtered flow velocity-time curve, so that the interference of various normal water on water leakage detection can be eliminated, accurate water leakage detection is realized, and the water leakage detection method has the advantages of high detection accuracy and convenience in implementation.
2. The invention comprises two optional judgment conditions aiming at the filtered flow rate-time curve, and if the instantaneous value of the flow rate at the appointed time exceeds a first preset threshold value or the average value of the flow rate at the appointed time period exceeds a second preset threshold value, the problem of water leakage at the tail end of the water meter is judged, so that the water leakage detection aiming at the time or the time period can be realized.
Drawings
FIG. 1 is a schematic diagram of a basic flow of a method according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a water supply system in an embodiment of the invention.
Detailed Description
As shown in fig. 1, the method for detecting water leakage of a water meter of the present embodiment includes:
1) acquiring a flow speed-time curve of the water meter;
2) searching the rising edge and the falling edge of the flow velocity in the flow velocity-time curve, and rejecting flow velocity signals between the starting time of the rising edge and the ending time of the falling edge of the flow velocity to obtain a filtered flow velocity-time curve;
3) and aiming at the filtered flow speed-time curve, if the instantaneous value of the flow speed at a specified moment exceeds a first preset threshold value or the average value of the flow speed at a specified time interval exceeds a second preset threshold value, judging that the water leakage problem exists at the tail end of the water meter.
The key means for eliminating the interference of various normal water on water leakage detection in the water meter leakage detection method of the embodiment is to search the rising edge and the falling edge of the flow speed in the flow speed-time curve, and reject the flow speed signal in the middle of the rising edge and the falling edge of the flow speed to obtain the filtered flow speed-time curve. According to the method, the flow speed-time curve of the normal water consumption is analyzed, if a plurality of water consumption points exist, the pulse signal can have multiple amplitudes, and the pulse signal can have a single amplitude at a single water consumption point.
Considering that different habits of users who open and close the valve during normal water use are different, in order to improve the accuracy of detecting the rising edge and the falling edge, when the rising edge and the falling edge of the flow rate are searched in the flow rate-time curve in step 2) of the embodiment, the rising edge and the falling edge refer to that the straight line segment is judged to be the rising edge by performing piecewise straight line fitting on the flow rate-time curve, and if the slope range of a certain straight line segment obtained by fitting falls between (0,90 °); and if the slope range of a certain straight line segment obtained by fitting falls between-90 degrees and 0), judging the straight line segment as a falling edge.
In order to eliminate the interference of flow rate adjustment during normal water use and the problem that the two ends cannot be continuously detected due to discontinuity of the starting time, in step 2) of this embodiment, when the rising edge and the falling edge of the flow rate are found in the flow rate-time curve, if a plurality of continuous rising edges are found, the plurality of continuous rising edges are combined into one rising edge; if a plurality of continuous falling edges are found, combining the plurality of continuous falling edges into one falling edge; if the first found falling edge is found when the rising edge and the falling edge of the flow speed are found, the starting moment is taken as the rising edge; if the last found rising edge is found when the rising edge and the falling edge of the flow speed are found, the ending moment is taken as the falling edge.
Considering the problem of water leakage caused by forgetting to close after normal water use, in order to implement water leakage detection under the above conditions, step 2) of this embodiment further includes detecting a time difference between adjacent rising edges and falling edges, and if the time difference exceeds a third preset threshold, it is determined that the water leakage problem exists at the end of the water meter, and at this time, an early warning message may be further sent to the user as needed; after the flow velocity signals between the rising edge and the falling edge of the flow velocity are removed in the step 2), the step of supplementing the flow velocity data at any time between the starting time of the rising edge and the ending time of the falling edge by interpolation is further included, the water leakage flow in the normal water using time can be obtained by interpolation processing, and therefore the complete water leakage state information at each time and each time interval can be obtained.
In addition, the present embodiment further provides a water meter with a water leakage detection function, which includes a microprocessor and a sensor for detecting a flow rate or a flow velocity of the water meter, wherein the microprocessor and the sensor are connected to each other, and the microprocessor is programmed or configured to perform the steps of the water leakage detection method for the water meter according to the present embodiment.
As shown in fig. 2, this embodiment further provides a water supply system, which includes a main water pipe 1 and a plurality of branch water pipes 2 connected in parallel to the main water pipe 1, a plurality of main water meters 11 are disposed on the main water pipe 1, one branch water meter 21 is disposed on each branch water pipe 2, the main water meters 11 are in one-to-one correspondence with the branch water pipes 2, each main water meter 11 is disposed at an upstream of a junction point where the corresponding branch water pipe 2 is connected to the main water pipe 1, and some or all of the main water meters 11 and the branch water meters 21 are the aforementioned water meters with water leakage detection function, so that water leakage detection of all pipelines can be realized. Referring to fig. 2, in the embodiment, a main water pump 12 is disposed at a water inlet end of the main water pipe 1, and the main water pump 12 is a part of a water supply system. In some cases, however, the water supply system is supplied from the outside, and the main water pump 12 is not required.
As shown in fig. 2, as an alternative embodiment, the present embodiment further includes a control device 3, a secondary water supply pump 22 and a reservoir 23 for supplying water to the water load of the branch pipe 2 are sequentially connected in series to some or all of the branch pipes 2, a control end of the secondary water supply pump 22 is connected to the control device 3, and the main water meter 11 and the branch water meters 21 are respectively connected to the control device 3 through a wired cable or a wireless network. Referring to fig. 2, the left side is a water diversion pipe 2 for direct water supply, and the right side is an example of a water diversion pipe 2 for secondary water supply through a reservoir 23, which can be arranged as required. Furthermore, the control end of the main water pump 12 is likewise connected to the control device 3 for centralized control by the control device 3.
In addition, on the basis of the water supply system, the embodiment further provides an application method of the water supply system, which includes the step of executing the water leakage detection of the merging point of the water diversion pipe:
s1) collecting the flow of the main water meter 11 and the water diversion meter 21;
s2), aiming at the confluence point of each branch pipe 2 connected to the main water pipe 1, firstly, calculating the sum of the flow of the main water meter 11 adjacent to the downstream of the confluence point and the flow of the branch water meters 21 on each branch pipe 2 to be converged as the downstream total flow of the confluence point, then judging whether the flow of the main water meter 11 adjacent to the upstream of the confluence point is equal to the downstream total flow of the confluence point within a specified time period, and if so, judging that the water leakage problem exists between the confluence point and the adjacent main water meter 11 or the branch water meters 21. Taking the merging point a in fig. 2 as an example, first, the sum of the flow rate a1 of the main water meter 11 downstream of the merging point and the flow rate a2 of the branch water meter 21 on the corresponding branch water pipe 2 is calculated as the total downstream flow rate of the merging point, then it is determined whether the flow rate a3 of the main water meter 11 upstream of the merging point is equal to the total downstream flow rate of the merging point within a specified time period, and if so, it is determined that the water leakage problem exists between the merging point a and the adjacent main water meter 11 or the branch water meter 21 (the pipeline where the flow rates a 1-a 3 are located). By the above mode, the water leakage detection of the confluence point of the water distribution pipe can be conveniently realized.
In addition, the embodiment further comprises the step of executing the water leakage detection of the pipelines between the water dividing meter and the reservoir: recording the starting time t of each automatic start of the secondary water supply pump 22 at the lowest water level1And a stop time t of automatic stop after reaching the highest water level2The starting time t is obtained after the automatic stop of the secondary water supply pump 22 each time after the reservoir 23 reaches the maximum water level1Stop time t2Time period Δ t in between1Flow Q of water meter 21 on internal corresponding water distribution pipe 21If the flow rate Q1If the difference value between the preset calibration value delta Q and the preset value delta Q is larger than a fourth preset threshold value, the problem of water leakage of the pipeline between the sub-water meter 21 and the corresponding reservoir 23 is judged; wherein the preset calibration value Δ Q is the capacity difference between the highest and lowest water levels of the reservoir 23.
In addition, the embodiment further includes counting the flow of the main water meter 11 close to the water inlet end of the main water pipe 1 in each time period in the designated period, and controlling the working state (such as power or rotation speed) of the main water pump 12 for supplying water to the main water pipe 1 in each time period in the designated period according to the flow, so that the water pressure in the main water pipe 1 in each time period in the designated period is positively correlated with the flow of the time period, thereby realizing water supply and pipeline pressure adjustment according to the water consumption rule of the user, saving energy, and prolonging the service life of a pipe network and water supply equipment.
In addition, the control method generally adopted by the secondary water supply pump 22 at present is an automatic execution control strategy of automatic start of the lowest water level and automatic stop of the highest water level of the water reservoir 23. However, considering that this minimum level is actually intended to ensure normal use of the water load, there is also a large volume between this minimum level and the zero level of the reservoir 23Poor, this capacity difference lies in guaranteeing the normal use of water load at daytime's meaning, but in the time slot of the infrequent water consumption such as evening, because user's water consumption can reduce by a wide margin, still adopt above-mentioned strategy will lead to secondary water supply pump 22 to frequently open and stop, can reduce secondary water supply pump 22's life like this, because open and stop the great electric energy that can waste of electric current, secondary water supply pump 22 frequently opens and stops still can the noise generation moreover, can especially disturb people in the time slot of the infrequent water consumption such as evening. In order to solve the above technical problem, the present embodiment further includes the step of the control device 3 performing optimal control on the secondary water supply pump 22 in the preset infrequent water usage time period: at the beginning time t of entering a preset time period of non-frequent water consumption3Then, first, the stop time t at which the last secondary water supply pump 22 is automatically stopped after the reservoir 23 reaches the maximum water level is acquired based on the history data of the water meter 21 on the corresponding water distribution pipe 22Start time t3The average flow or the maximum flow of the water load on the intermediate water distribution pipe 2 is recorded as the required flow Q2Then the water reservoir 23 reaches the maximum water storage amount Q of the highest water level3Minus the demanded flow Q2Obtaining the initial water storage quantity Q of the reservoir 23 entering the preset time period of the infrequent water consumption4If the initial water storage capacity Q4Less than a predetermined amount of infrequent water Q5Then according to the initial water storage quantity Q4Non-frequent water consumption Q5The difference activates the secondary water supply pump 22 to increase the water storage amount of the reservoir 23 to the infrequent water use amount Q5Then, the automatic execution control strategy of the automatic start of the lowest water level and the automatic stop of the highest water level of the secondary water supply pump 22 is shielded, and the automatic execution control strategy of the automatic start of the lowest water level and the automatic stop of the highest water level of the secondary water supply pump 22 is replied at the end of the preset non-frequent water consumption time period; the amount of said infrequent water used Q5The water consumption upper limit of the preset time period of the non-frequent water consumption. By the above mode, frequent start and stop of the secondary water supply pump 22 in an infrequent water consumption time period such as at night and the like can be effectively reduced, noise generated by frequent start and stop of the secondary water supply pump 22 can be reduced, the service life of the secondary water supply pump 22 can be prolonged, and water supply energy consumption is reduced.
In summary, when water leakage occurs in the water supply network, the water leakage amount is superimposed on other normal water consumption amount in a period of time, and the normal water consumption is always in a pulse form, so that the method of the embodiment eliminates the interference of the normal water consumption by eliminating the flow speed signal between the rising edge and the falling edge of the flow speed, and finds the following rule: the occurrence of the water leakage fault can be clearly judged and the specific water leakage amount can be analyzed when the constant flow occurs. Meanwhile, if the normal water consumption and the use time are further analyzed, the use of the water for the user can be known, such as: when washing vegetables and cooking, when bathing, when washing clothes and the like, if the change rule of daily water consumption of each building is further analyzed, the method of the embodiment draws the water consumption rule of one district, one campus, one community or the whole urban area into a water consumption curve, and controls the water supply amount and the water supply pressure of the whole water supply network according to the curve, and different pipelines of each building, each district, each campus and each community adopt different control modes according to different water consumption rules, such as opening a pressurized water pump in different time sections, adjusting the water supply amount and the like, so that the service life of the pipe network is shortened due to the fact that the pipe network is kept under high pressure for a long time, and meanwhile, the service life of the water pump is also shortened. Therefore, the method of the embodiment supplies water and adjusts the pressure of the pipeline according to the water consumption rule of the user, not only saves energy, but also prolongs the service life of a pipe network and water supply equipment. Certainly, the water leakage is found and repaired in time, a large amount of water resources can be saved, and multiple purposes can be achieved.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. A water leakage detection method for a water meter is characterized by comprising the following steps:
1) acquiring a flow speed-time curve of the water meter;
2) searching the rising edge and the falling edge of the flow velocity in the flow velocity-time curve, and rejecting flow velocity signals between the starting time of the rising edge and the ending time of the falling edge of the flow velocity to obtain a filtered flow velocity-time curve;
3) and aiming at the filtered flow speed-time curve, if the instantaneous value of the flow speed at a specified moment exceeds a first preset threshold value or the average value of the flow speed at a specified time interval exceeds a second preset threshold value, judging that the water leakage problem exists at the tail end of the water meter.
2. The water leakage detection method for the water meter according to claim 1, wherein in step 2), when the rising edge and the falling edge of the flow rate are searched in the flow rate-time curve, the rising edge and the falling edge are obtained by fitting the flow rate-time curve with a piecewise straight line, and if the slope range of a straight line segment obtained by fitting falls between (0,90 ° ]), the straight line segment is determined as the rising edge; and if the slope range of a certain straight line segment obtained by fitting falls between-90 degrees and 0), judging the straight line segment as a falling edge.
3. The water leakage detection method for a water meter according to claim 2, wherein, when the rising edge and the falling edge of the flow rate are searched in the flow rate-time curve in the step 2), if a plurality of continuous rising edges are found, the plurality of continuous rising edges are combined into one rising edge; if a plurality of continuous falling edges are found, combining the plurality of continuous falling edges into one falling edge; if the first found falling edge is found when the rising edge and the falling edge of the flow speed are found, the starting moment is taken as the rising edge; if the last found rising edge is found when the rising edge and the falling edge of the flow speed are found, the ending moment is taken as the falling edge.
4. The water leakage detection method for the water meter according to claim 3, wherein the step 2) further comprises detecting a time difference between adjacent rising edges and falling edges, and if the time difference exceeds a third preset threshold, determining that the water leakage problem exists at the tail end of the water meter; after the flow velocity signals in the middle of the rising edge and the falling edge of the flow velocity are removed in the step 2), the method further comprises the step of supplementing the flow velocity data at any time between the starting time of the rising edge and the ending time of the falling edge through interpolation.
5. A water meter with water leak detection, comprising a microprocessor and a sensor for detecting the flow or velocity of the water meter, said microprocessor and sensor being interconnected, characterized in that said microprocessor is programmed or configured to perform the steps of any one of the claims 1 to 4 of the water leak detection method for a water meter.
6. The utility model provides a water supply system, its characterized in that, includes many distributive pipes (2) of main water pipe (1) and parallel connection on main water pipe (1), be equipped with a plurality of main water meters (11) on main water pipe (1), be equipped with one on each distributive pipe (2) and divide water gauge (21), main water gauge (11) and distributive pipe (2) one-to-one, and each main water gauge (11) arrange in corresponding distributive pipe (2) insert the joining point upper reaches of main water pipe (1), partial or all are claim 5 in main water gauge (11) and distributive pipe (21) water gauge with leak detection function.
7. A water supply system according to claim 6, characterized by further comprising a control device (3), wherein a secondary water supply pump (22) and a reservoir (23) for supplying water to the water load of the water distribution pipe (2) are sequentially connected in series to part or all of the water distribution pipe (2), the control end of the secondary water supply pump (22) is connected with the control device (3), and the main water meter (11) and the water distribution meter (21) are respectively connected with the control device (3) through a wired cable or a wireless network.
8. A method of using the water supply system of claim 7, comprising the step of performing a manifold junction water leak detection:
s1) collecting the flow of the main water meter (11) and the water diversion meter (21);
s2) aiming at the confluence point of each shunt pipe (2) connected to the main water pipe (1), firstly, calculating the sum of the flow of the main water meter (11) adjacent to the downstream of the confluence point and the flow of the shunt meter (21) on each confluent pipe (2) as the downstream total flow of the confluence point, then judging whether the flow of the main water meter (11) adjacent to the upstream of the confluence point is equal to the downstream total flow of the confluence point within a specified time period, and if so, judging that the water leakage problem exists between the confluence point and the adjacent main water meter (11) or shunt meter (21);
the method also comprises the step of executing pipeline water leakage detection between the sub water meter and the reservoir: recording the starting time t of each automatic start of the secondary water supply pump (22) at the lowest water level1And a stop time t of automatic stop after reaching the highest water level2The starting time t is obtained after the secondary water supply pump (22) is automatically stopped each time after the reservoir (23) reaches the highest water level1Stop time t2Time period Δ t in between1The flow Q of the water diversion meter (21) on the inner corresponding water diversion pipe (2)1If the flow rate Q1If the difference value between the water meter and the preset calibration value delta Q is larger than a fourth preset threshold value, the problem of water leakage of a pipeline between the water meter (21) and the corresponding reservoir (23) is judged; wherein the preset calibration value delta Q is the capacity difference of the reservoir (23) between the highest water level and the lowest water level.
9. The method for applying the water supply system according to claim 8, further comprising counting the flow rate of the main water meter (11) near the water inlet end of the main water pipe (1) in each time period in a specified period, and controlling the working state of the main water pump (12) for supplying water to the main water pipe (1) in each time period in the specified period according to the flow rate so that the water pressure in the main water pipe (1) in each time period in the specified period is positively correlated with the flow rate in the time period.
10. The method of using a water supply system according to claim 9, further comprising the step of the control means (3) optimally controlling the secondary water supply pump (22) for a preset period of infrequent water usage: at the beginning time t of entering a preset time period of non-frequent water consumption3Then, firstly, the stop time t of the last secondary water supply pump (22) for automatically stopping after the reservoir (23) reaches the highest water level is obtained based on the historical data of the water diversion table (21) on the corresponding water diversion pipe (2)2Start time t3Between themThe average flow or the maximum flow of the water load on the water pipe (2) is recorded as the required flow Q2Then the water reservoir (23) reaches the maximum water storage amount Q of the highest water level3Minus the demanded flow Q2Obtaining the initial water storage quantity Q of the reservoir (23) entering the preset time period of the infrequent water consumption4If the initial water storage capacity Q4Less than a predetermined amount of infrequent water Q5Then according to the initial water storage quantity Q4Non-frequent water consumption Q5The difference activates the secondary water supply pump (22) to increase the water storage capacity of the reservoir (23) to the non-frequent water consumption Q5Then shielding the automatic execution control strategy of automatic start of the lowest water level and automatic stop of the highest water level of the secondary water supply pump (22), and replying the automatic execution control strategy of automatic start of the lowest water level and automatic stop of the highest water level of the secondary water supply pump (22) at the end of the preset non-frequent water consumption time period; the amount of said infrequent water used Q5The water consumption upper limit of the preset time period of the non-frequent water consumption.
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