JPH04318436A - Method and device for detecting leak of water - Google Patents

Abstract

PURPOSE:To automatically detect a leak of water without omission by comparing the data about a water using amount in a preset specific time zone of the day with a preset value and discriminating that the leak of water takes place when the daily water using amount continuously exceeds the preset value for several days. CONSTITUTION:The cumulative water using amounts in a specific time zone of the day is continuously stored in a memory 4a for several days. A preset value is also stored in the memory 4a. A computing element 4 always reads time of a clock 5 and is set to a standby state except the specific time zone. The element 4 repeats such an operating cycle every day that, when the specific time zone comes, the element 4 is automatically set in a measuring state and performs data processing after fetching input signals and when the end of the time zone comes, the element 4 performs a process for discriminating the occurrence of a leak of water on the daily data and automatically returns to the standby state. The occurrence of a leak of water is discriminated by the element 4 which compares the daily data with the set value and discriminates whether or not the difference meets the condition of a leak of water.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water leakage detection method and a water leakage detection device used directly to carry out the method.

0002

[Background Art] To detect water leakage, record the flow rate at night when no water is normally used, and set a set value on a preset counter.If the overnight flow rate exceeds this set value, There was a mechanical method of issuing a warning. In addition, instead of this mechanical method, a primitive method is being used in which humans analyze nighttime water usage data to determine the presence or absence of water leaks.

0003

[Problem to be Solved by the Invention] The former of the above-mentioned conventional techniques judges that a water leak has occurred and issues a warning when the water consumption data for just one night exceeds a set value. There was a problem in that the system would incorrectly issue a warning as a water leak when a faucet was opened for one night or water flowed due to nighttime construction work.

[0004] Furthermore, the latter of the above-mentioned conventional techniques has the problem of requiring manual analysis, which is troublesome. Therefore, the present invention eliminates the risk of giving a false warning.
Moreover, it is an object of the present invention to provide a water leakage detection method that does not require human labor.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the water leakage detection method of the present invention measures and stores the amount of water used during a predetermined specific time period of the day, and in this way, the amount of water used is continuously measured and stored. Water usage data for several days is compared with a preset set value, and a water leak is determined when the amount of water used at a specific time every day during the several days exceeds the set value. Features.

[0006] In order to achieve the above object, the water leakage detection device of the present invention uses a transaction meter (2) installed in a water pipe (1) and a flow rate signal from this transaction meter (2) as input. A calculator (4) for cumulatively counting the amount of water used during a specific time period of the day, a clock (5), and a specific time period for several days following the pre-assumed specific time period of the day. a memory (4a) for storing water usage data and preset setting values;
) is characterized in that it includes a program that issues a water leak warning when the usage amount during a specific time period every day over the several days exceeds the set value.

[0007]

[Embodiment] The embodiment shown in Fig. 1 is a water leak detection device suitable for public facilities such as schools, where 1 is a water distribution pipe, 2 is a transaction (water supply) meter installed in the water distribution pipe 1, and 3 is a pulse The electrical pulse, which is the flow rate signal, from the transaction meter 2 is relayed by the repeater. Reference numeral 4 denotes a calculation unit consisting of a microcomputer, which inputs the flow rate signal from the transaction meter 2 relayed by a pulse repeater, and calculates the flow rate at a predetermined specific time of the day, for example, from 10:00 PM to 6:00 AM at night. The amount of water used until then is counted and stored in the memory 4a. The specific time is stored in the memory 4a in advance. The memory 4a also stores preset values.

[0008] In this way, the amount of water used during a specific time period of one day is counted and stored in the memory 4a every day over several days. The calculator 4 constantly reads the time from the clock 5 and is in a standby state except during a specific time period, that is, during a measurement time period. Time in a specific time period, e.g. PM
At 10:00, it automatically enters the measurement state, takes in the input signal and processes the data, and at the end of a specific time period, for example at 6:00 PM, it performs the leakage conditioning process on one day's worth of data and automatically The process of returning to standby mode is repeated every day. Judgment of water leakage is made by calculating whether the data of one day, which is limited every day, meets the leakage conditions.
This is done by processing.

[0009] Water leakage judgment conditions are determined as water leakage when the following conditions (1) and (2) are met. (1) The amount of water used during the specified time period during the day exceeds the set value. (Even during set times when water is not normally used, such as at night, a small amount of water may be used by facility managers or maintainers for toilets, drinking, etc.) (2) Water usage that exceeds the set value in (1) above continues for several days (for example, 7 days) and occurs at a specific time every day. To be seen.

The specific operation is as follows. First of all,
The above water leakage conditions (1
) is automatically stored in the internal memory 4a of the arithmetic unit 4 for seven days. As shown in FIG. 2, the data written at this time is stored at the bottom of the memory, and the memory is moved up in order, and the contents of the memory 7 days ago are erased.

[0011] At the same time as being stored in the memory, the data of the past seven days already stored in the memory and the data of the current day, that is, the data of the seven days from the data of the current day are read out, the following contents are determined, and a warning is printed and an alarm is output. . (a) If the amount of water used exceeds the set value on a single occasion, it is determined that there is a suspicion of water leakage, and a message "Beware of water leakage" is displayed and the alarm lamp 6 is turned on.

(b) When the amount of water used in a specific time period exceeds the set value every day for 7 consecutive days, a message saying "Water is leaking" is displayed and the warning lamp 6 flashes, Automatically prints the amount of water used (that is, water leakage data) at a specific time every day for 7 days.

[0013]

As described above, the water leakage detection method and apparatus of the present invention are free from the possibility of issuing a false alarm by mistake, and can automatically detect water leakage at an early stage without requiring any human intervention.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of a water leakage detection device of the present invention.

FIG. 2 is a diagram illustrating the state of a memory in the embodiment of the invention shown in FIG. 1;

Claims (2)

[Claims] [Claim 1] Measuring and storing the amount of water used during a predetermined specific time period of the day, and comparing the data of the amount of water used for several consecutive days thus measured and stored with a preset setting value, A water leakage detection method characterized in that a water leakage is determined when the amount of water used in a specific time period every day over the several days exceeds the set value. [Claim 2] A transaction meter (2) installed in the water distribution pipe (1) and a flow rate signal from this transaction meter (2) are inputted to calculate the cumulative amount of water used during a specific time of the day. a calculator (4), a clock (5), and a computer that stores data on water usage and preset values for the specific time period assumed in advance during the day and the specific time period for several consecutive days. the arithmetic unit (4a);
) is a water leakage detection device characterized by comprising a program that issues a water leakage alarm when the amount of water used in a specific time period every day over the several days exceeds the set value.