JP2021128140A - Water leakage monitoring system - Google Patents

Abstract

To provide a water leakage monitoring system which is hardly affected by increasing/decreasing trends of daily minimum flow rate value or seasonal fluctuations, and which does not require changing an initial value.SOLUTION: A water leakage monitoring system 80 calculates, on the basis of first and third quartiles Q1, Q3 of daily minimum flow rate value data for several years, a water leakage determination value H and a water leakage alert determination value h which constitute criteria for determining the occurrence of water leakage. For this reason, extremely large and extremely small daily minimum flow rate values are excluded, and these values are not concerned with the water leakage determination value H and water leakage alert determination value h. Thus, it is possible to determine water leakage by criteria that are stable throughout a year. The water leakage monitoring system 80 equipped with an area specification unit 38 and pertaining to the present invention specifies a water leakage occurrence path and a water leakage caution path on the basis of water leakage occurrence determination and water leakage caution determination with respect to a plurality of measurement units 40 installed in a water distribution path. Thus, it is possible for a manager, etc., to immediately grasp the range of water leakage examination.SELECTED DRAWING: Figure 3

Description

The present invention relates to a leak monitoring system that monitors leaks in piping routes.

Japan's water supply is an important social capital that is indispensable for social life and economic activities that stably supplies safe water that can be drunk directly to various places. Then, general clean water is sent from a water purification facility or the like to a water supply and distribution facility such as a distribution reservoir through a trunk pipe, and is supplied to various places through a water distribution pipe network connected to this water supply and distribution facility. Here, when water leaks occur in these water distribution pipe networks, they are often not detected at the initial stage of the occurrence of water leaks. Then, as this water leakage state continues, the effect gradually becomes apparent, and eventually the water overflows on the ground, which may be exposed. The occurrence of such water leakage not only causes a decrease in yield (the amount of water for which there was toll revenue ÷ the amount of water produced at the water purification plant), but in some cases it causes enormous damage such as water outages and road collapses. May affect.

Regarding this problem, for example, in the following [Patent Document 1], attention is paid to the daily minimum flow rate value in the nighttime period when the amount of tap water used is the least in the day, and a linear approximation formula of the daily minimum flow rate value in the target period. An invention relating to a water leakage detection device for determining that water leakage has occurred when the difference between the value of the inclination of the water supply and the initial value of the daily minimum flow rate value exceeds a certain standard is described.

Japanese Unexamined Patent Publication No. 7-167732

However, the invention described in [Patent Document 1] is based on the premise that the daily minimum flow rate value increases with the passage of time starting from the initial value of the target period, and is based on the initial value of the target period. There is a problem that the accuracy of leak detection is lowered depending on the method of taking. Further, if the daily minimum flow rate value is kept substantially constant and continued for a long period of time, there is a problem that the accuracy of water leakage detection is lowered. Further, since the daily minimum flow rate value changes depending on the season, it is necessary to change the initial value each time, and there is a problem that the burden on the operator is heavy in practical use.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a leak monitoring system that is not easily affected by the increasing / decreasing tendency of the daily minimum flow rate value and seasonal fluctuations and does not need to change the initial value.

The present invention
(1) A leak monitoring system that detects leaks in the distribution route.
It has a measurement unit 40 installed on the water distribution path and a determination unit 42 for determining the occurrence of water leakage.
The measuring unit 40 includes a flow meter 30 that acquires the flow rate of water at the installation location.
The determination unit 42 monitors the flow rate and sets the value of the smallest flow rate in a day as the daily minimum flow rate value, and data processing for calculating the water leakage determination value H from the daily minimum flow rate value. A unit 34 and a water leakage determination unit 36 that determines the occurrence of water leakage when the daily minimum flow rate value exceeds the water leakage determination value H.
The data processing unit 34 calculates the water leakage determination value H based on the first quartile Q1 and the third quartile Q3 when the daily minimum flow rate values within a predetermined period are arranged in ascending order. The above problem is solved by providing the characteristic leak monitoring system 80.
(2) The data processing unit 34 calculates the water leakage determination value H from the preset coefficient K, the first quartile Q1, and the third quartile Q3.
H = Q3 + K (Q3-Q1)
The above problem is solved by providing the leak monitoring system 80 according to the above (1), which is characterized by the above-mentioned formula.
(3) The data processing unit 34 further has a second coefficient k smaller than the coefficient K, and from the second coefficient k, the first quartile Q1, and the third quartile Q3,
h = Q3 + k (Q3-Q1)
Calculate the leak warning judgment value h by the formula of
The leak determination unit 36 further determines the downstream leak caution when the daily minimum flow rate value exceeds the leak warning determination value h a predetermined number of times within a predetermined period (2). The above problem is solved by providing the leak monitoring system 80 according to the above.
(4) Data of the daily minimum flow rate value exceeding the water leakage warning judgment value h and not less than the water leakage judgment value H, data of the daily minimum flow rate value exceeding the water leakage judgment value H, and the daily minimum of the water leakage warning judgment value h or less. The above problem is solved by providing the water leakage monitoring system 80 according to the above (3), which is characterized in that the data of the flow rate value is displayed in a graph that can be discriminated from the data.
(5) A plurality of measurement units 40 are installed on the water distribution route, and a central management unit 90 having an area identification unit 38 is further provided.
The water leakage determination unit 36 determines the occurrence of water leakage for each measurement unit 40, and determines the occurrence of water leakage.
The area identification unit 38 is
The most downstream measuring unit 40 determined to have leaked water is specified, and if there is no measuring unit 40 downstream of the specified measuring unit 40, the piping route downstream of the specified measuring unit 40 is used as the water leakage occurrence route. If there is a measurement unit 40 that has not been determined to have leaked water downstream of the specified measurement unit 40, the piping route excluding the piping route downstream of the measurement unit 40 that has not been determined to have leaked water has leaked. The above problem is solved by providing the water leakage monitoring system 80 according to any one of the above (1) to (4), which is specified as a generation route.
(6) The central management unit 90 has a determination unit 42.
The monitoring unit 32 monitors the flow rate information for each measurement unit 40 and outputs the daily minimum flow rate value for each measurement unit 40, and the data processing unit 34 starts each measurement unit 40 from the daily minimum flow rate value for each measurement unit 40. The leak monitoring system 80 according to (5) above is provided, wherein the leak determination value H is calculated, the leak determination unit 36 determines the occurrence of water leakage for each measurement unit 40, and outputs the data to the area identification unit 38. By doing so, the above problem is solved.
(7) By providing the water leakage monitoring system 80 according to any one of the above (1) to (6), wherein the determination of the occurrence of water leakage is output to the output means 48 via the wide area communication network. Solve the above problems.

The leak monitoring system according to the present invention has a leak determination value H which is a criterion for determining the occurrence of water leakage based on the first quartile Q1 and the third quartile Q3 of the daily minimum flow rate values for several years, and a leak determination value H. The leak warning determination value h is calculated. Therefore, the extremely large daily minimum flow rate value and the extremely small daily minimum flow rate value are excluded, and these values are not related to the water leakage determination value H and the water leakage warning determination value h. As a result, it is possible to determine water leakage based on a stable reference value throughout the year. Further, in the configuration provided with the area identification unit, the water leakage occurrence route and the water leakage caution route are specified based on the determination results for a plurality of measurement units installed on the water distribution route. As a result, the manager or the like can immediately grasp the scope of the leak investigation.

It is a figure which shows the leak monitoring system which concerns on this invention. It is a figure which shows another example of the leak monitoring system which concerns on this invention. It is a figure which shows the leak monitoring system which concerns on this invention which provided the area identification part. It is a graph for demonstrating the data processing of the leak monitoring system which concerns on this invention.

The leak monitoring system according to the present invention will be described with reference to the drawings. Here, FIGS. 1 and 2 are diagrams showing an example in which the leak monitoring system 80 according to the present invention is used alone, and FIG. 3 is a diagram showing an example of using the leak monitoring system 80 according to the present invention when the area specifying portion is provided and used in a wide area. It is a figure which shows. Although the present invention will be described here mainly by taking the water distribution pipe network of the water supply as an example, the present invention is not limited to the water supply, and can be applied to industrial water, hot spring water, hot water pipes, and other pipes. It is possible. Further, the leak monitoring system 80 of the present invention only detects and notifies the possibility of water leakage, and the administrator or the like receives the determination contents of these leak monitoring systems 80 and conducts a leak investigation. The scope of the survey is judged.

First, the leak monitoring system 80 according to the present invention is installed on a water distribution path from a water distribution starting point 10 such as a water purification plant shown in FIG. 3 to a water distribution pipe network A to F, and is shown in FIGS. 1 and 2. As shown, it has a measurement unit 40 installed on the water distribution path and a determination unit 42 for determining the occurrence of water leakage. Note that FIG. 1 shows a configuration in which a determination unit 42 is provided at the installation location of the measurement unit 40 to determine the occurrence of water leakage at the installation location, and FIG. 2 shows a configuration in which only the measurement unit 40 is installed on the water distribution path for determination. Section 42 shows a configuration in which it is installed at another location. When the determination unit 42 is installed in another location, the measurement unit 40 and the determination unit 42 are connected wirelessly or by wire, and information is transmitted via a wide area communication network (Internet) or a premises communication network (intranet). Will be.

Then, the measuring unit 40 has at least a flow meter 30 that acquires the flow rate of water flowing down the pipe at the installation location, and in a configuration in which the measuring unit 40 and the determination unit 42 are wirelessly connected, the flow meter 30 is acquired. It is provided with a transmission unit 44a that transmits information on the flow rate of water at the installation location to the determination unit 42 side. The place where the measuring unit 40 is installed is not particularly limited, but in the water supply, it is preferably provided in the water distribution facility 12, and particularly preferably in the water pipe of the distribution reservoir. At this time, if the water distribution facility 12 is provided with a flow meter, this flow meter may also be used as the flow meter 30 of the measuring unit 40. Further, when the water distribution route to be installed is provided with another water leakage monitoring system, a flow rate monitoring device, or the like, the function of the water leakage monitoring system 80 according to the present invention may be added to these. For example, when these systems and devices are provided with an information processing unit that processes flow rate data, processing programs such as a data processing unit 34 and a water leakage determination unit 36 are independently created and installed in this information processing unit. The leak monitoring system 80 according to the present invention may be constructed. The same applies to the leak monitoring system 80 used in a wide area, which will be described later.

Further, the determination unit 42 includes a monitoring unit 32 that monitors the flow rate of the flow meter 30 and acquires a daily minimum flow rate value, and a data processing unit 34 that calculates a water leakage determination value from the daily minimum flow rate value acquired by the monitoring unit 32. The data processing unit 34 has at least a water leakage determination unit 36 that determines the occurrence of water leakage based on the water leakage determination value calculated by the data processing unit 34 and the daily minimum flow rate value acquired by the monitoring unit 32. In the configuration in which the measurement unit 40 and the determination unit 42 are wirelessly connected, the reception unit 44b is connected to the front stage of the determination unit 42 to receive the flow rate information transmitted from the measurement unit 40 (transmission unit 44a). Output to the monitoring unit 32.

Next, the operations of the measurement unit 40 and the determination unit 42 of the water leakage monitoring system 80 will be described. First, the flow meter 30 of the measuring unit 40 is a general well-known flow meter, and constantly acquires the flow rate of water flowing down the piping at the installation location. Then, the acquired water flow rate information is output to the determination unit 42 directly or via the transmission unit 44a.

Further, the monitoring unit 32 constituting the determination unit 42 includes a time measuring unit, monitors the flow rate acquired by the flow meter 30, and sets the smallest flow rate in the day as the daily minimum flow rate value, and sets the data processing unit 34. And output to the water leakage determination unit 36. Further, the data processing unit 34 acquires and stores the daily minimum flow rate value from the monitoring unit 32. Then, the daily minimum flow rate value for a predetermined period, for example, the latest 1 to 5 years, preferably the latest 4 years, is accumulated. Here, FIG. 4A shows a graph in which the accumulated daily minimum flow rate values are arranged in chronological order. Since the population parameter of the data (daily minimum flow rate value) required to calculate the water leakage judgment value H and the water leakage warning judgment value h, which will be described later, differs depending on the distribution characteristics of the data, it is in a stable state (for example, for 25 consecutive days). It is preferable to start the operation after the occurrence of the water leakage warning judgment value h). When the daily minimum flow rate value for a predetermined period is accumulated, the oldest daily minimum flow rate value is overwritten by the new daily minimum flow rate value, and the daily minimum flow rate data string described later is updated daily.

Next, the data processing unit 34 creates a daily minimum flow rate data string by arranging the accumulated daily minimum flow rate values for a predetermined period in ascending order. Here, the daily minimum flow rate data sequence in which the data of FIG. 4 (a) is arranged in ascending order is shown in FIG. 4 (b). Next, the data processing unit 34 acquires the first quartile Q1 and the third quartile Q3 of the created daily minimum flow rate data string. The first quartile is the value located at the 1 / 4th position when the data is arranged in ascending order and divided into 4 equal parts, and the 3rd quartile is the value located at the 3/4th position. be. Here, the first quartile Q1 in the example of FIG. 4B was 215 L, and the third quartile Q3 was 487 L. Next, the data processing unit 34 calculates the water leakage determination value H from the acquired first quartile Q1 and third quartile Q3 and the preset coefficient K, for example, based on the following formula.
H = Q3 + K (Q3-Q1)
The coefficient K is set to an appropriate value according to the installed water distribution route, but is preferably about 1 or more and less than 2, and most preferably around 1.5. Then, for example, in the example of FIG. 4B when the coefficient K is 1.5, the water leakage determination value H is H = 487 + 1.5 × (487-215) = 895.

When the water leakage determination value H is determined in this way, the water leakage determination unit 36 compares the latest daily minimum flow rate value with the water leakage determination value H. Then, when the latest daily minimum flow rate value exceeds the water leakage determination value H, it is determined that water leakage has occurred. Then, the output means 48 displays the determination of the occurrence of water leakage to notify the user. The output means 48 here includes a monitor, a personal computer, a printer, and the like. Further, it may be connected wirelessly or by wire and output to a remote personal computer as an output means 48 or a mobile terminal such as a smartphone or tablet owned by an administrator via a wide area communication network or a premises communication network. In particular, when the judgment content is output to a mobile terminal such as a smartphone or tablet, it is preferable to transmit the information via a wide area communication network (Internet). Then, the manager or the like receives the determination of the occurrence of this leak and confirms whether there is an event or case where water is used all day in the downstream area, night construction, weather conditions, or the like. Then, it is determined whether or not to carry out a leak investigation.

Further, the data processing unit 34 further has a second coefficient k smaller than the coefficient K, and from the second coefficient k, the first quartile Q1, and the third quartile Q3,
Based on the equation h = Q3 + k (Q3-Q1)
A leak warning determination value h having a threshold value lower than the water leakage determination value H may be calculated. This second coefficient k is also set to an appropriate value according to the installed water distribution route, but it is preferably a value of about 1. Here, in the example of FIG. 4B when the coefficient k is 1.0, the water leakage warning determination value h is
h = 487 + 1.0 × (487-215) = 759.

Then, in the configuration having the water leakage warning judgment value h, in addition to the above-mentioned judgment based on the water leakage judgment value H, the water leakage judgment unit 36 determines a day when the daily minimum flow rate value exceeds the water leakage warning judgment value h and is equal to or less than the water leakage judgment value H. When a predetermined number of times, for example, twice in 3 days, etc. occur within the period of, the water leakage caution is determined. Then, for example, the output means 48 described above is used to output the notification. Upon receiving this judgment of water leakage caution, the manager, etc. confirms whether there are any continuous events or incidents that use water all day in the downstream area, night construction, weather conditions, etc. Then, it is determined whether or not to carry out a leak investigation.

As described above, the leak monitoring system 80 according to the present invention calculates the leak determination value H and the leak warning determination value h based on the first quartile Q1 and the third quartile Q3 in a predetermined period. Therefore, it is possible to exclude the influence of a value extremely larger than the so-called outlier value and an extremely small value. Further, by setting the calculation period of the first quartile Q1 and the third quartile Q3 to several years, the influence of seasonal fluctuations and the like can be reduced.

The leak monitoring system 80 displays the daily minimum flow rate value acquired daily for the above-mentioned output means 48 in a time-series graph as shown in FIG. 4A, and further, the daily minimum flow value exceeding the leak determination value H is displayed. It is possible to discriminately display the data of the flow rate value, the data of the daily minimum flow rate value exceeding the water leakage warning judgment value h and equal to or less than the water leakage judgment value H, and the data of the daily minimum flow rate value of the water leakage warning judgment value h or less. preferable. As this display, the discrimination display by color coding is most preferable. For example, the data of the daily minimum flow rate value exceeding the water leakage judgment value H is displayed in red or the like, and the daily minimum daily minimum flow rate value exceeding the water leakage warning judgment value h and equal to or less than the water leakage judgment value H. It is preferable that the flow rate data is displayed in orange or the like, and the daily minimum flow rate data of the leak warning judgment value h or less is displayed in black or blue. In FIG. 4A, the data of the daily minimum flow rate value exceeding the water leakage determination value H is indicated by a white circle, and the data of the daily minimum flow rate value exceeding the water leakage warning determination value h and equal to or less than the water leakage determination value H is indicated by an gray circle. The data of the daily minimum flow rate value of the leak warning judgment value h or less is displayed in black. As a result, the manager or the like can visually check the daily minimum flow rate value in chronological order and visually grasp the transition of the daily minimum flow rate value before the day when the water leakage occurrence judgment and the water leakage caution judgment occur. As a result, it is possible to more accurately determine whether or not to conduct a leak investigation.

Next, the water leakage monitoring system 80 according to the present invention provided with the area specifying unit 38 and used in a wide area will be described with reference to FIG. Here, the operation of the leak monitoring system 80 provided with the area identification unit 38 will be described by taking the output of the leak occurrence determination as an example, but the basic operation is also in specifying the leak caution route by the output of the leak caution determination. Exactly the same. First, in the leak monitoring system 80 according to the present invention provided with the area identification unit 38 shown in FIG. 3, a plurality of measurement units 40a to 40d and 40f are installed on the water distribution path, and the central management system including the area identification unit 38 is provided. It further has a part 90. In FIG. 3, the water distribution starting point 10 (water purification plant) is branched into two water distribution facilities 12a and 12b, and these two water distribution facilities 12a and 12b are branched into two water distribution facilities 12c and 12d and water distribution facilities 12e and 12f, respectively. An example of doing this is shown. Water distribution pipe networks A to F are connected to the water distribution facilities 12a to 12f, respectively, and measurement units 40a to 40d and 40f are provided to the water distribution facilities 12a to 12d and 12f excluding the water distribution facilities 12e, respectively.

The determination unit 42 may be provided in the measurement units 40a to 40d and 40f, respectively, but it is most preferable to provide the determination unit 42 in the central management unit 90 as shown in FIG. Here, in a configuration in which the determination units 42 are provided on the measurement units 40a to 40d and 40f, respectively, the determination result of water leakage is transmitted from the measurement units 40a to 40d and 40f to the central management unit 90, and the area identification unit 38 Will specify the water leakage generation route, which will be described later, based on the presence or absence of determination of water leakage generation from the measurement units 40a to 40d and 40f side. Further, in the water leakage monitoring system 80 including the area identification unit 38, for example, the monitoring unit 32 of the determination unit 42 may be provided in each measurement unit 40, and the data processing unit 34 and the water leakage determination unit 36 may be provided in the central management unit 90. good. In these configurations, since the transmitted information is only the daily minimum flow rate value or the determination result of the occurrence of water leakage, the communication frequency between each measurement unit 40 and the central management unit 90 can be reduced.

Further, although information transmission between the measurement units 40a to 40d and 40f and the central management unit 90 (determination unit 42) may be performed by wire, transmission units 44a are provided on the measurement units 40a to 40d and 40f, respectively, and central management is performed. It is preferable to provide the receiving unit 44b on the unit 90 side and perform the operation wirelessly. Then, in the configuration in which the determination unit 42 is provided in the central management unit 90, the flow meters 30 of the measurement units 40a to 40d and 40f acquire the flow rate of the water at the installation location, respectively, and output the flow rate to the transmission unit 44a. The transmission unit 44a periodically transmits information on the flow rate of water from the flow meter 30 to the reception unit 44b at preset time intervals such as 10 seconds, 1 minute, and 5 minutes. The receiving unit 44b of the central management unit 90 receives the flow rate information transmitted from the receiving units 44b of the measuring units 40a to 40d and 40f, and outputs the information to the monitoring unit 32 of the determination unit 42. The signal transmitted by the receiving unit 44b includes identification information, and it is possible to determine which measuring units 40a to 40d and 40f output the signal. Then, the monitoring unit 32 of the central management unit 90 monitors the flow rate information from these measurement units 40a to 40d and 40f for each measurement unit 40a to 40d and 40f, and the daily minimum flow rate value for each measurement unit 40a to 40d and 40f. Is output. Further, the data processing unit 34 of the central management unit 90 arranges the daily minimum flow rate values for each of the measurement units 40a to 40d and 40f output by the monitoring unit 32 in ascending order for each of the measurement units 40a to 40d and 40f, and arranges the measurement units 40a to 40f. A daily minimum flow rate data string is created every 40d and 40f. Then, the data processing unit 34 acquires the first quartile Q1 and the third quartile Q3 of the daily minimum flow rate data string for each of the created measurement units 40a to 40d and 40f, respectively. Then, the water leakage determination value H (and the water leakage warning determination value h) of each of the measuring units 40a to 40d and 40f is calculated based on the above-mentioned formula. In this way, when the water leakage determination value H of each of the measurement units 40a to 40d and 40f is determined, the water leakage determination unit 36 of the central management unit 90 determines the latest daily minimum flow rate value and water leakage for each of the measurement units 40a to 40d and 40f. Compare with the value H respectively. Then, when the latest daily minimum flow rate value exceeds the leak determination value H, the measurement units 40a to 40d and 40f are determined to have leaked. Upon receiving the determination result of the leak determination unit 36, the area identification unit 38 identifies the leak occurrence route as follows, for example.

Here, it is assumed that water leakage occurs in the water distribution pipe network C. In this case, the water leakage determination unit 36 determines that water leakage has occurred at the measurement unit 40c of the water distribution equipment 12c and the measurement unit 40a of the water distribution equipment 12a located upstream of the measurement unit 40c. However, since no water leakage has occurred in the water distribution pipe network D, the measurement unit 40d of the water distribution equipment 12d does not determine that a water leakage has occurred. In this case, the area specifying unit 38 identifies the most downstream measuring unit 40c determined to have leaked water, and if the measuring unit 40 does not exist downstream of the specified measuring unit 40c, the specified measuring unit 40c The water distribution pipe network C, which is a downstream piping route, is specified as a water leakage occurrence route. Then, for example, the output means 48 described above is used to output the notification.

Further, it is assumed that water leakage occurs in the water distribution pipe network A. In this case, the water leakage determination unit 36 determines that water leakage has occurred at the measurement unit 40a of the water distribution facility 12a. However, the measurement units 40c and 40d of the water distribution equipments 12c and 12d located downstream of the water distribution equipment 12a do not determine that water leakage has occurred. In this case, the area specifying unit 38 first identifies the most downstream measuring unit 40 (here, the measuring unit 40a) that is determined to have leaked water. Then, it is confirmed whether or not there is a measuring unit 40 that has not been determined to have leaked water downstream of the specified measuring unit 40a. Here, there are measuring units 40c and 40d downstream of the measuring unit 40a, which have not been determined to have leaked water. In this case, the area identification unit 38 is a piping route (water distribution pipe network A and water distribution equipment 12a, 12c, 12d) excluding the water distribution pipe networks C and D, which are the pipe routes downstream of the measurement units 40c and 40d that are not determined to have leaked. (Piping route between) is specified as a leak occurrence route. Then, for example, the output means 48 described above is used to output the notification.

Further, it is assumed that water leakage occurs in the water pipe network B or the water pipe network E. In this case, the water leakage determination unit 36 determines that water leakage has occurred at the measurement unit 40b of the water distribution equipment 12b. However, since no water leakage has occurred in the water distribution pipe network F, the measurement unit 40f of the water distribution equipment 12f is not determined to have a water leakage. Since the measuring unit 40 is not installed in the water distribution equipment 12e, it is not possible to determine the occurrence of water leakage. In this case, the area specifying unit 38 first identifies the most downstream measuring unit 40 (here, measuring unit 40b) determined to have leaked water. Then, it recognizes the existence of the measurement unit 40f that has not been determined to have leaked water downstream from the specified measurement unit 40b. In this case, the area identification unit 38 is between the water distribution pipe networks B and E and the water distribution equipments 12b, 12e and 12f, excluding the water distribution pipe network F which is the downstream piping route of the measurement unit 40f which is not determined to have leaked water. (Piping route) is specified as a water leakage occurrence route. Then, for example, the output means 48 described above is used to output the notification.

As described above, the leak monitoring system 80 according to the present invention is a criterion for determining the occurrence of leaks based on the first quartile Q1 and the third quartile Q3 of the daily minimum flow value data for several years. The water leakage determination value H and the water leakage warning determination value h are calculated. Therefore, the extremely large daily minimum flow rate value and the extremely small daily minimum flow rate value are excluded, and these values are not related to the water leakage determination value H and the water leakage warning determination value h. As a result, it is possible to determine water leakage based on a stable reference value throughout the year.

Further, the water leakage monitoring system 80 according to the present invention provided with the area specifying unit 38 determines the water leakage occurrence route and the water leakage caution route based on the water leakage occurrence determination and the water leakage caution determination for a plurality of measurement units 40 installed on the water distribution route. Identify. As a result, the manager or the like can immediately grasp the scope of the leak investigation.

Since the configuration, operation, mechanism, piping route, etc. of each part of the leak monitoring system 80 shown in this example are examples, the present invention is not particularly limited to this example, and the present invention does not deviate from the gist of the present invention. It is possible to change and implement within the range.

30 flow meter
32 Monitoring unit
34 Data processing unit
36 Leakage judgment unit
38 Area Specific Department
40 Measuring unit
42 Judgment unit
48 Output means
80 Leakage monitoring system
90 Central Administration Department
Q1 1st quartile
Q3 3rd quartile

Claims (7)

A leak monitoring system that detects leaks in the distribution route.
It has a measurement unit installed on the water distribution route and a determination unit that determines the occurrence of water leakage.
The measuring unit is provided with a flow meter that acquires the flow rate of water at the installation location.
The determination unit includes a monitoring unit that monitors the flow rate and sets the value of the smallest flow rate in a day as the daily minimum flow rate value, and a data processing unit that calculates a water leakage determination value from the daily minimum flow rate value. It is provided with a water leakage determination unit that determines the occurrence of water leakage when the daily minimum flow rate value exceeds the water leakage determination value.
The data processing unit is characterized in that the leak determination value is calculated based on the first quartile and the third quartile when the daily minimum flow values within a predetermined period are arranged in ascending order. Leakage monitoring system. The data processing unit calculates the water leakage determination value H from the preset coefficient K, the first quartile Q1, and the third quartile Q3.
H = Q3 + K (Q3-Q1)
The leak monitoring system according to claim 1, wherein the leak monitoring system is performed according to the above formula. The data processing unit further has a second coefficient k smaller than the coefficient K, and from the second coefficient k, the first quartile Q1, and the third quartile Q3,
h = Q3 + k (Q3-Q1)
Calculate the leak warning judgment value h by the formula of
The second aspect of claim 2, wherein the leak determination unit further determines the downstream leak caution when the daily minimum flow rate value exceeds the leak warning determination value h a predetermined number of times within a predetermined period. Leakage monitoring system. The data of the daily minimum flow rate value exceeding the water leakage warning judgment value h and equal to or less than the water leakage judgment value H, the data of the daily minimum flow rate value exceeding the water leakage judgment value H, and the daily minimum flow rate value exceeding the water leakage warning judgment value h The leak monitoring system according to claim 3, wherein the data is displayed in a graph that can be discriminated from the data. Multiple measurement units are installed on the water distribution route, and there is also a central management unit with an area identification unit.
The leak judgment unit determines the occurrence of water leakage for each measurement unit.
The area identification part is
The most downstream measuring unit determined to have leaked water is specified, and if there is no measuring unit downstream of the specified measuring unit, the piping route downstream of the specified measuring unit is specified as the water leakage occurrence route.
If there is a measurement unit that has not been determined to have leaked water downstream from the specified measurement unit, specify the piping route excluding the piping route downstream of the measurement unit that has not been determined to have leaked water as the water leakage occurrence route. The leak monitoring system according to any one of claims 1 to 4, wherein the leak monitoring system is characterized. The central management department has a judgment unit
The monitoring unit monitors the flow rate information for each measurement unit and outputs the daily minimum flow rate value for each measurement unit.
The data processing unit calculates the water leakage judgment value of each measurement unit from the daily minimum flow rate value of each measurement unit.
The water leakage monitoring system according to claim 5, wherein the water leakage determination unit determines the occurrence of water leakage for each measurement unit and outputs the data to the area identification unit. The water leakage monitoring system according to any one of claims 1 to 6, wherein the determination of the occurrence of water leakage is output to the output means via a wide area communication network.

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