JPH09304218A - Detector for water leakage in water inlet pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To immediately detect water leakage for informing by inputting measured data by a water meter provided on a connection end of a distributing pipe and a measuring meter provided on a water feed end of a water inlet pipe for obtaining difference between both data and outputting a water leakage detection signal when the difference exceeds an allowable range. SOLUTION: Measured data of a water department meter 4, that is a pulse signal, is transmitted to a water leakage detecting controller 8. Then a measuring meter 7 also transmits measured data, that is a pulse signal, to the controller 8. The controller 8 receives measured data from both meters 4, 7 for obtaining difference in a data comparison part, and then compares the difference with an allowable value preset in a data setting part. If water leaks in a middle point 2a of a water inlet pipe 2, the difference exceeds the allowable range, and a detection part 8c outputs a water leakage detection signal as water leakage occurrence. The signal causes an alarm 9 to activate, an alarm lamp 10 to light up, and informs water leakage occurrence, so that an operator closes a stop valve.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply lead-in pipe leakage detection device for automatically detecting water leak from a water supply lead-in pipe connected to a water distribution pipe to notify or stop the water leak.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram showing a conventional water supply facility. In the figure, a water supply pipe 101 for supplying water to each building is connected to a water pipe 101 owned by a water bureau buried in a ground G. ing. A water stop valve 103 and a water station meter 104 for measuring the amount of water supplied to the building are provided at the end of the water supply pipe connecting side of the water supply pipe 102, and the water supply side end of the water supply pipe 102 for the water receiving tank 105 is provided. Is the water level T in the receiving tank
A constant water valve 106 that opens and closes is provided. Water is supplied from the water receiving tank 105 to each faucet in the building through a water supply pipe (not shown).

Next, the operation will be described. Water pipe 101
From water supply inlet pipe 102 water shutoff valve 106, water station meter 1
04, when water is supplied to the water receiving tank 105 through the constant water stop valve 106, the floating body 106 changes due to a change in the water level T in the water receiving tank 105.
When the position of a changes and the floating body 106a reaches the specified position, the constant water stop valve 106 is closed and the water supply to the water receiving tank 105 is stopped.

If water leaks at a point 102a in the middle of the water supply pipe 102 during this water supply, the amount of water leak is added to the amount of water supplied to the water receiving tank 105, and the measured value of the water meter 104 increases beyond the amount of water supply.

[0005]

Since the conventional water supply system is constructed as described above, even if water leaks in the middle of the water supply pipe 102, the water supply pipe 102 is buried in the ground G or the building. Because the water is hidden inside the building and the ground G, the water leak cannot be detected until the water leak is found unless the water meter meter's measured amount has increased significantly compared to normal times. Takes a long time. Therefore, there is a problem that the water is wastefully consumed and the building is damaged due to water leakage.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a water supply lead-in pipe leakage detection device capable of immediately detecting and notifying a water leak occurring in a water supply lead-in pipe. And

It is another object of the present invention to provide a water supply pipe leakage detecting device which can immediately detect water leakage generated in the water supply pipe and stop the water leakage to minimize damage caused by the water leakage.

[0008]

According to a first aspect of the present invention, there is provided a water supply pipe leakage detecting device, wherein the water supply pipe is connected to a water supply pipe, and the water supply pipe is connected to the water supply pipe connecting end side. A water station meter, a measurement meter provided on the water supply end side of the water intake pipe, and measurement data of the water station meter and the measurement meter are input to obtain a difference between the two measurement data, and the difference is preset. Comparing with the permissible range, the former is provided with a computing means for outputting a water leak detection signal when the latter exceeds the latter, and the notifying means is closed by the water leak detection signal from the computing means.

According to the second aspect of the present invention, there is provided a water supply pipe leakage detecting device, which is provided with a water stop valve on the side of the water supply pipe connecting end of the distribution pipe, and which closes the water stop valve in response to a water leakage detection signal from the computing means. It was made to let.

In the water supply pipe leakage detection device according to the third aspect of the present invention, a warning device / alarm lamp is used as a notification means.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below.

Embodiment 1 1 is a block diagram showing a water supply facility to which a water supply pipe leakage detection device according to a first embodiment of the present invention is applied. In the figure, each water pipe 1 owned by a water bureau buried in a ground G is connected to each building. A water supply lead-in pipe 2 for supplying water to is connected to. A water stop valve 3 and a water station meter 4 for measuring the amount of water supplied in the building are provided at the end of the water supply pipe connecting side of the water supply pipe, and the water supply side end of the water receiving tank 5 is connected to the inside of the water receiving tank. Fixed water valve 6 that opens and closes depending on the water level T
And a measuring meter 7 for measuring the amount of water supply. Water is supplied from the water receiving tank 5 to each faucet in the building through a water supply pipe (not shown).

The water supply station meter 4 and the measuring meter 7
Is a meter with a pulse transmitter that outputs a pulse according to the measured flow rate. Leakage detection control device 8 as arithmetic means for inputting the output pulses of both meters 4 and 7
A warning device 9 as an informing means and an alarm lamp 10 are connected to.

FIG. 2 is a block diagram of the inside of the water leakage detection control device 8, which includes a data setting unit 8a for setting an allowable range of difference in measured data between the water station meter 4 and the measurement meter 7, and the water station meter 4 and measurement. A data comparison unit 8b for matching the measurement data of the meter 7 for use, and a detection unit 8c for detecting that the difference between the data matched by the data comparison unit 8b exceeds an allowable range preset in the data setting unit 8a. There is.

Next, the operation of the flowchart shown in FIG. 3 will be described. Water stop valve 3 from water distribution pipe 1 to water intake pipe 2,
When water is supplied to the water receiving tank 5 through the water station meter 4 and the fixed water valve 7, the position of the floating body 6a changes due to the change in the water level T in the water receiving tank 5, and when the floating body 6a reaches the specified position, the fixed water valve 6 is turned on. The water supply to the water receiving tank 5 is stopped.

At the time of this water supply, the water supply station meter 4 transmits measurement data corresponding to the water supply amount, that is, a pulse signal to the water leakage detection control device 8 (step S1). Next, the measurement meter 7 also transmits the measurement data corresponding to the water supply amount, that is, a pulse signal to the water leakage detection control device 8 (step S2).

The water leakage detection control device 8 receives the measurement data from both the meters 4 and 7, and after the data comparing section 8b finds the difference between the two measurement data, sets the difference in the data setting section 8a in advance. The data comparison unit 8b compares whether or not the allowable range has been exceeded (step S3). If there is no water leakage, the difference between the two measurement data will not exceed the allowable range, but if water leakage occurs at point 2a in the middle of the water supply pipe 2, the difference between the two measurement data will be larger than the allowable range. The detection unit 8c that has detected the water leakage detection signal outputs a water leakage detection signal. The alarm device 9 is operated by this water leak detection signal (step S4), the alarm lamp 10 is turned on (step S5), and the occurrence of water leak is notified. The operator can stop the water leakage by closing the water shutoff valve 3 when the worker knows that the water leakage has occurred.

Embodiment 2. FIG. 4 is a configuration diagram showing a water supply facility to which the water supply inlet pipe leakage detection device according to the second embodiment of the present invention is applied. In the figure, a water distribution pipe 1, a water station meter 4, a water tank 5, a fixed water stop valve 6 are shown. The measurement meter 7, the water leakage detection control device 8, the alarm device 9, and the alarm lamp 10 are the same as those in the first embodiment shown in FIG. In this embodiment, a water shutoff valve 11 such as a solenoid valve is provided at the end of the water supply pipe 2 on the side of the water distribution pipe connection, which receives a water leak detection signal from the water leak detection control device 8 and closes. Is.

Next, the operation will be described. The water supply operation and the water leak detection operation are the same as those in the first embodiment. When water leakage is detected by the water leakage detection control device 8 and a water leakage detection signal is output, the water stop valve 11 closes in response to the water leakage detection signal. As a result, the water supply from the water distribution pipe 1 to the water supply intake pipe 2 is stopped and water leakage is eliminated,
Less damage to buildings due to wasted water and leakage.

[0020]

As described above, according to the invention described in claim 1, the water meter provided on the side of the water supply pipe connecting end of the water supply pipe and the measuring meter provided on the side of the water supply end of the water supply pipe. By inputting the measurement data to the calculation means, the difference between the two measurement data is obtained, and if the difference exceeds the preset allowable range, the water leak is detected and the occurrence of the water leak is informed. There is an effect that the occurrence can be notified immediately and damage to the building due to waste of water and leakage can be prevented.

According to the second aspect of the present invention, since the occurrence of water leakage is notified and the water leakage is automatically stopped, waste of water and damage to the building due to water leakage can be reduced more reliably. There is an effect that can be.

According to the third aspect of the present invention, since the occurrence of water leakage is informed by sound / light, the water leakage can be informed accurately by light in a noisy place and sound in a bright place. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a water supply facility to which a water supply inlet pipe leakage detection device according to a first embodiment of the present invention is applied.

FIG. 2 is an internal configuration diagram of a water leakage detection control device.

FIG. 3 is a flowchart illustrating the operation of the first embodiment.

FIG. 4 is a configuration diagram showing a water supply facility to which a water supply inlet pipe leakage detection device according to a second embodiment of the present invention is applied.

FIG. 5 is a configuration diagram showing a conventional water supply facility.

[Explanation of symbols]

1 water distribution pipe, 2 water supply intake pipe, 4 water bureau meter, 7
Measuring meter, 8 Leakage detection control device (computing means), 9
Alarm device (informing means), 10 alarm lamp (informing means), 11 water stop valve.

Claims (3)

[Claims] 1. A water supply intake pipe connected to a water supply pipe, a water station meter provided on the water supply pipe connection end side of the water supply intake pipe, and a measurement meter provided on the water supply end side of the water supply intake pipe. Calculation of inputting the measurement data of the water station meter and the measurement meter to obtain the difference between the two measurement data, comparing the difference with a preset allowable range, and outputting a leak detection signal when the former exceeds the latter A water supply lead-in pipe leakage detection device comprising: a means and an informing means that operates in response to the leakage detection signal to notify the occurrence of leakage. 2. A water supply valve according to claim 1, further comprising a water shutoff valve which is provided on the water supply pipe connecting end side of the water feed-in pipe and closes and stops when receiving a water leak detection signal from the computing means. Intake pipe leakage detection device. 3. The water supply lead-in pipe leakage detection device according to claim 1, wherein the notification means is a warning device / alarm lamp.