JP3133373B2 - Water pipe leak detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting water leakage in a water supply pipe for supplying water or hot water to a faucet or a faucet such as a shower faucet.

[0002]

2. Description of the Related Art Conventionally, an electrode type or float type leak sensor for detecting accumulated water is provided at a location where water leaking from a water supply pipe is collected, so as to detect leakage of the water supply pipe. I was

[0003]

However, in the case of the above-mentioned conventional technique, it is necessary to provide a water leak sensor at all locations where water leaking from a water supply pipe is collected, so that the cost for water leak detection is very high. It was attached. Moreover, it has been impossible to detect water leakage from the faucet due to forgetting to close the faucet or failure of the faucet or the like. An object of the present invention is to eliminate the above disadvantages.

[0004]

A first characteristic configuration of a water leak detecting device for a water supply pipe according to the present invention is that a drive valve is interposed in a water supply pipe to a water faucet, and a drive valve and a water faucet of the water supply pipe are provided. A pressure sensor and a flow rate sensor are provided for detecting the pressure and flow rate of the pipe in a portion between the pressure sensor and the flow rate sensor. When the detected pressure of the pressure sensor is less than a set pressure, the drive valve is opened, and the detected pressure of the pressure sensor is A valve control unit that closes the drive valve when the pressure is equal to or higher than the set pressure, and a flow rate detected by the flow rate sensor in a state where the drive valve is open is supplied when the faucet is opened.
A first water leakage determination unit that outputs a water leakage detection signal when the flow rate is less than a set flow rate that is a minimum flow rate when water is provided is provided.

[0005] The second embodiment of the water supply pipe leakage detecting device according to the present invention.
Characteristic configuration, a drive valve is interposed in a water supply pipe to a water faucet, and a pressure sensor and a flow rate sensor for detecting a pressure and a flow rate in a pipe between a drive valve and a water faucet in the water supply pipe are provided, A valve control unit that opens the drive valve when the pressure detected by the pressure sensor is lower than a set pressure, and closes the drive valve when the pressure detected by the pressure sensor is equal to or higher than the set pressure; and the drive valve The flow rate detected by the flow rate sensor is longer than the water supply usage time associated with the opening operation of the faucet in the state in which the opening operation is performed.
The minimum water supply time with over had set time opening operation of the water faucet
A second leak determination unit that outputs a leak detection signal when the flow rate is maintained at or above the set flow rate is provided.

A third embodiment of the water supply pipe leak detecting device according to the present invention.
Characteristic configuration, a drive valve is interposed in a water supply pipe to a water faucet, and a pressure sensor and a flow rate sensor for detecting a pressure and a flow rate in a pipe between a drive valve and a water faucet in the water supply pipe are provided, A valve control unit that opens the drive valve when the pressure detected by the pressure sensor is lower than a set pressure, and closes the drive valve when the pressure detected by the pressure sensor is equal to or higher than the set pressure; and the drive valve The flow rate detected by the flow rate sensor in the state where the opening operation is performed is the minimum flow rate at the time of water supply accompanying the opening operation of the faucet.
A first water leakage determination unit that outputs a water leakage detection signal when the flow rate is less than a certain set flow rate, and a water supply usage time associated with the opening operation of the faucet when the detection flow rate of the flow rate sensor is in a state where the drive valve is open.
And a second water leakage determination unit that outputs a water leakage detection signal when the flow rate is maintained at or above the set flow rate for a longer set time.

[0007]

[Function] By setting the set pressure and set flow rate smaller than the pressure and flow rate at the time of water supply when the faucet is opened, if there is no leakage, the detected pressure will be increased by opening the faucet. The drive valve interlocks with the faucet, such that the drive valve opens when the pressure drops below the set pressure and the drive valve closes when the detected pressure exceeds the set pressure when the faucet is closed. Does not hinder use.

[0008] Then, the defective part of the water pipe, forgetting to tighten,
If a small amount of water leaks from the broken faucet, water pressure will drop due to the leakage, and the detected pressure will fall below the set pressure, as in the case of water supply with the faucet open. When the water supply is used, the water in the pipe flows at a flow rate equal to or higher than the set flow rate with the opening operation of the drive valve, but if a small amount of water leaks, The flow rate of water in the pipe accompanying the opening operation of the drive valve is less than the set flow rate. That is, it can be determined whether the water supply is used or a small amount of water leaks based on whether the flow rate in the state where the drive valve is opened is equal to or more than the set flow rate or less than the set flow rate. Paying attention to the above point, in the first and third characteristic configurations, the detected flow rate in a state where the drive valve is in the open state is such that the water faucet is detected.
Since the water leakage detection signal is output when the flow rate is less than the set flow rate, which is the minimum flow rate at the time of water supply due to the opening operation , a small amount of water leakage can be detected separately from water supply use.

[0009] On the other hand, if a leak occurs in which a large amount of water leaks from a defective portion of the water supply pipe, or a water tap that has been forgotten to be closed, or a malfunctioning water tap, the pressure in the pipe drops due to the water leak, and the water tap is used by opening the water tap. As in the case of, the detected pressure drops below the set pressure and the drive valve opens, but in the case of water supply use, when the use is over, the faucet is closed and the flow rate becomes zero, When a large amount of water leakage occurs, the flow rate is maintained at or above the set flow rate indefinitely until the water leakage is stopped manually. And water use is usually one hour or two.
It is not performed continuously over a long period of time. Therefore, it is possible to determine whether the water supply is used or a large amount of water leaks based on the time during which the flow rate is maintained at or above the set flow rate with the drive valve opened. Focusing on the above points,
In the second and third characteristic configurations, the detected flow rate is determined based on the water supply usage time associated with the opening operation of the faucet when the drive valve is open.
When the flow rate is maintained over the set flow rate for a long time, the water leak detection signal is output.By setting the set time slightly longer than the maximum water use time, a large amount of water can be It can be detected separately.

[0010]

As described above, according to the present invention, since water leakage is detected based on the pipe pressure and flow rate, it is only necessary to provide one drive valve , one pressure sensor and one flow rate sensor in the water supply pipe. It can be implemented at low cost and can detect not only leakage from the water supply pipe but also leakage from the faucet due to forgetting to close the faucet or failure.

[0011]

EXAMPLES leak detecting apparatus, as shown in FIG. 2, there since also the water supply pipe 3 to the water faucet 2 is branched and connected to the water mains 1 and leak detection target leak detector 4 and the body 5 6 is a water stop valve and 7 is a water meter.

The water leak detector 4 is a motor-operated valve (an example of a drive valve driven by a motor) provided in the water supply pipe 3.
A pressure tank 9 connected to an intermediate portion of the water supply pipe 3 between the electrically operated valve 8 and the faucet 2, a pressure sensor 10 for detecting a pipe pressure P in the intermediate portion, and a flow rate Q of the intermediate portion. And a flow rate sensor 11 for detection. The pressure tank 9
Is to accumulate the pressure in the pipe accompanying the closing of the faucet 2 and guarantee the water supply pressure when the faucet 2 is opened with the electric valve 8 closed. The pressure sensor 10
Is a pressure switch that is turned on when the pipe pressure P is less than the set pressure P ₀ , and is turned off when the pipe pressure P is equal to or more than the set pressure P _{0. The} flow sensor 11 is turned off when the flow rate Q becomes equal to or more than the set flow rate Q ₀ . This is a flow switch that is turned on when it becomes less than the pressure, and is hereinafter referred to as a pressure switch 10 or a flow switch 11. And the pressure tank 9 and the pressure switch 10
It is attached to the piping member 3A connected to the electric valve 8,
The flow switch 11 is attached to a piping member 3B connected to the piping member 3A. The set pressure P ₀ is:
The set flow rate Q ₀ is a pressure smaller than the internal pressure when all the faucets 2 are closed, and the set flow rate Q ₀ is smaller than the flow rate when water is supplied with the faucets 2 opened. To give specific numerical examples, the set pressure P ₀ is about 0.5 kg / cm ² , the flow rate when supplying water with one faucet 2 opened is 5 to 20 liters per minute, and the set flow rate Q ₀ Is 2 liters per minute.

As shown in FIG. 1, the main body 5 includes a valve control unit 12, a first water leakage judgment unit 13, a second water leakage judgment unit 14, and a notification unit 15. As shown in FIG. 3, the valve control unit 12 opens the electric valve 8 by turning on the pressure switch 10 based on the detection result of the pressure switch 10,
The drive circuit 8A of the motor-operated valve 8 is controlled so as to be closed when turned off. As shown in FIG. 3, the first water leakage determination unit 13 determines whether the faucet is closed based on the on / off state of the flow switch 11 when the electric valve 8 is open .
It is determined whether leakage at the set flow rate Q ₀ following flow is the minimum flow rate of the water supply time due to the opening operation has occurred, in the case of leakage, the electric valve in preference to the valve controller 12 8 And outputs a water leak detection signal S to the drive circuit 8A and the drive circuit 15A of the notification unit 15 so as to activate the notification unit 15. Specifically, a counter C for measuring the number of times the flow switch 11 is turned off, and a valve closing signal is output until the measured value n of the counter C reaches the set number n ₀ , while the measured value n is the set number n ₀ , A discriminating circuit 16A that outputs a water leak detection signal S, a first timer TM1 that starts counting each time a valve closing signal is output from the discriminating circuit 16A, and a time measured by the first timer TM1. When t ₁ reaches a first set time T ₁ , a discrimination circuit 16B that outputs a preferential valve closing signal to the valve control unit 12
When the flow rate Q becomes equal to or more than the set flow rate Q ₀ and the flow switch 11 is turned on before the measurement time t ₁ becomes the first set time T ₁ , the determination circuit 16 that outputs the second timer operation signal
C. That is, the water pressure causes the pipe pressure P to fall below the set pressure P ₀ to open the motor-operated valve 8, and after the open operation, the flow switch 11 is continuously turned off for the first set time T _1. Water leakage is determined by repeating n ₀ . The first
The setting time T ₁ is variable.
It is a value between ３００300 seconds.

As shown in FIG. 3, the second water leak judging section 14 keeps the flow switch 11 turned on for a second set time T _{2 while the} electric valve 8 is open. It is determined that a water leak has occurred at a flow rate equal to or higher than the set flow rate Q ₀ , and the two-way drive is performed so that the electric valve 8 is closed prior to the valve control unit 12 and the notification unit 15 is operated. It outputs a water leak detection signal S to the circuits 8A and 15A. The second set time T ₂ is set at the faucet 2
Open the water supply for longer than the usage time. That is, in both the case where water leakage occurs at a flow rate equal to or higher than the set flow rate Q ₀ and the case where water is supplied with the faucet 2 opened,
Although the flow switch 11 is turned on, the water supply is for a short time, and the leakage is not time-limited, and it is determined whether the leakage or the water supply is based on the time. A real value example is 1 to 10 hours.
And, specifically, the flow a second timer TM2 to start counting on the basis of the ON switch 11, the second timer TM2 by the measurement time t ₂ is the second set time T ₂ and the leak detection Discrimination circuit 17 that outputs signal S
And the flow switch 1 during counting by the second timer TM2.
Water supply stop determination circuit 1 that outputs a valve closing signal when 1 is turned off
8, the third timer TM3 outputs a valve closing signal priority with a third time delay set time T ₃ when the output is closed signal from the water supply stop determination circuit 18 to the valve control unit 12
Consisting of Third timer TM3 is electrically operated valve 8 is closing operation in the temporary closing operation of the water faucet 2, as a result, which is for an electric valve 8 is prevented from hunting, the third set time T ₃ The time is 0 to 5 seconds to give an example of the real numerical value.
The timers TM1, TM2 and TM3 are set to the set times T ₁ ,
T ₂ and T ₃ can be changed.
The flow switch 11 can also change the set pressure P ₀ and the set flow rate Q ₀ . The notification unit 15 includes a buzzer 15
a and a lamp 15b.

Next, the operation will be briefly described. (Refer to FIG. 3) (1) The motor-operated valve 8 is on standby while being closed. (2) When the pipe pressure P falls below the set pressure P _{0 in the} standby state, the pressure switch 10 is turned on and the electric valve 8 is opened. (3) As a result, when the flow rate Q becomes larger than the set flow rate Q ₀ and the flow switch 11 is turned off, the faucet 2 is opened and it is determined that water is being used or water is leaked at the set flow rate Q ₀ or more. The second timer TM2 operates. (4) When the flow switch 11 until the second set time T ₂ has elapsed is turned on, the electric valve 8 is closed actuating the faucet 2 determines that the water supply stopping and closing operation, the (1 )
Return to standby state. The above is the operation in the normal case where there is no water leakage. (4-a) The flow switch 11 in the above (4)
There the second set time T ₂ remain turned off has elapsed, it is judged that the set flow rate Q ₀ or more water leakage, electric valve 8 while closing operation, the notification unit 15 is operated. This is the operation in the case where water leakage at the set flow rate Q ₀ or more occurs. (3-a) In the above (3), the flow switch 11
Remains on, the first timer TM1 operates. When the flow switch 11 is first set time T ₁ remains ON elapses, the electric valve 8 is closing operation it is determined that there is no water use of a water faucet 2 opening operation to, (1 ), When this is repeated the set number of times n _0, it is determined that water leaks below the set flow rate Q ₀ , and the electric valve 8 is closed and the notification unit 15 is operated. This is the operation when the leakage is less than the set flow rate Q ₀ has occurred. Note that if the flow switch 11 is turned off before the first timer TM1 elapses, the water supply is used, or
Determines that the set flow rate Q ₀ or more leakage, the process proceeds to (3).
That is, when there is water used in the middle of it is determined whether the leakage of less than the set flow rate Q ₀ is adapted to performed preferentially the water used.

A specific sequence circuit for performing the above operation by sequence control will be described below with reference to FIGS. 4, 5 and 6. RS is a reset switch, and RT is a reset external terminal. X0 to X13 are relays, and x0 to x13 are their contacts. TX
Reference numerals 1 to TX9 denote timers for setting operation timings.
1 to Tx9. CR is counter C
Cx is a count-up contact that operates when the counter C counts up, and T is a connection terminal of the buzzer 15a. The reset relay X0 is energized when the reset switch RS is turned on or the reset external terminal RT is turned on. First timer T
X1 is the normally closed contact x0 of the reset relay X0 and the twelfth
Power is supplied when the normally closed contact x12 of the relay X12 is turned on. The first relay X1 is turned on when all of the normally closed contact x0 of the reset relay X0, the normally closed contact x12 of the twelfth relay X12, and the normally closed contact Tx1 of the first timer TX1 are turned on. The reset circuit CR is energized when the normally open contact x1 of the first relay X1 is turned on. The second timer TX2
The current is supplied when the normally open contact Tx1 of the timer TX1 is turned on.
The second relay X2 is a normally open contact Tx1 of the first timer TX1.
When the normally closed contact Tx2 of the second timer TX2 is turned on, power is supplied. The third relay X3 and the third timer TX3 are configured such that one of the normally open contact x3 of the third relay X3 and the normally open contact x5 of the fifth relay X5 is turned on, and
The relay X2, the ninth relay X9, and the normally closed contacts x2, x9, and x0 of the reset relay X0 are turned on to turn on electricity. The fourth relay X4, the fourth timer TX4, and the fifth timer TX5 are configured such that one of the normally open contacts x4, x2, and x9 of the fourth relay X4, the second relay X2, and the ninth relay X9 is turned on, and Power is supplied when both the normally closed contact Tx3 of the timer TX3 and the normally closed contact x0 of the reset relay X0 are turned on. The fifth relay X5 is energized when both the normally open contact Tx4 of the fourth timer TX4 and the pressure switch 10 are turned on. The sixth relay X6 is energized when the flow switch 11 is turned on.

The seventh relay X7 is connected to the normally open contact Tx3 of the third timer TX3 and the normally open contact x6 of the sixth relay X6, or to the normally open contact x7 of the seventh relay X7.
Is turned on, and the normally closed contacts x10, x0, Tx of the tenth relay X10, the reset relay X0, and the fifth timer TX5.
5 is turned on to energize. Sixth timer TX6
Is energized when the normally open contact x7 of the seventh relay X7 is turned on, and the eighth relay X8 is energized by turning on both the normally open contact x7 of the seventh relay X7 and the normally closed contact Tx6 of the sixth timer TX6. . The counter C counts up when the normally open contact x8 of the eighth relay X8 is turned on. The first timer TM1 is energized by turning on both the normally open contact Tx6 and the count-up normally closed contact Cx of the sixth timer TX6. The seventh timer TX7 is energized by turning on the normally open contact Tm1 of the first timer TM1, and the ninth relay X
9 indicates that the normally open contact Tm1 is turned on and the seventh timer TX
7 is turned on to turn on the normally closed contact Tx7. Tenth
The relay X10 and the second timer TM2 are connected to a third timer T
Normally open contact Tx3 of X3 and normally closed contact x of sixth relay X6
6 are turned on, or the normally open contact x10 of the tenth relay X10 is turned on, and the reset relay X0, the third timer TM3, and the normally closed contact x0 of the ninth timer TX9,
Power is supplied when all of Tm3 and Tx9 are turned on.
The eleventh relay X11 and the third timer TM3 determine whether the normally open contact x10 of the tenth relay X10 and the normally open contact x6 of the sixth relay X6 are both turned on, or the eleventh relay X
11 and the normally closed contact x0 of the reset relay X0 are both turned on, and the normally closed contact x1 of the first relay X1 is turned on. 8th timer TX
8 is energized when the normally open contact Tm3 of the third timer TM3 is turned on, and the twelfth relay X12 is energized when the normally open contact Tm3 is turned on and the normally closed contact Tx8 of the eighth timer TX8 is turned on. I do. One of the count-up normally open contact Cx, the normally open contact Tm2 of the second timer TM2, and the normally open contact x13 of the thirteenth relay X13 is turned on, and the reset relay X0 is connected to the thirteenth relay X13 and the ninth timer TX9. Is turned on to turn on the normally closed contact x0.
The electric valve 8 is provided with a normally open contact x of the third relay X3.
When the normally closed contact x13 of the third and thirteenth relay X13 is connected in series between R and C, the buzzer 15a and the lamp 15b are closed when R and c are opened.
The thirteen normally open contacts x13 are turned on and turned on, respectively.

Next, the relation will be described. (1) When the reset switch RS is turned on, the reset relay X0 is energized, and when the normally closed contact x0 is turned off, the first, third, fourth, fifth, and ninth timers TX1, TX
3, TX4, TX5, TX9 and second and third timers T
The energization of M2 and TM3 is cut off to reset them, and the first, third, fourth, seventh, tenth, eleventh, and thirteenth relays X1, X3, X4, X7, X10, X11,
X13 is de-energized and reset. When the normally open contact x3 of the third relay X3 is turned off, R-c is opened, the electric valve 8 is closed, and the energization of the thirteenth relay X13 is cut off, so that the normally open contact x13 is turned off. Then, the buzzer 15a and the lamp 15b are reset. (2) When the reset switch RS is turned off, the energization of the reset relay X0 is cut off, and when the normally closed contact x0 is turned on, the first timer TX1 is energized and the reset switch RS is turned off.
, The first relay X1 is energized for a first set time until the normally closed contact Tx1 of the first timer TX1 is turned off, the reset circuit CR is energized to reset the counter C, and the third timer TM3 And the third timer TM3 is reset again. That is, the first timer TX1 guarantees the energizing time of the reset circuit CR so that the reset circuit CR operates reliably. (3) When the normally open contact Tx1 of the first timer TX1 is turned on, the second timer TX2 is energized with a delay of the first set time from the energization of the first timer TX1, and the first timer TX is energized.
After the second normally open contact Tx1 is turned on, the second timer TX2 is turned on for a second set time until the normally closed contact Tx2 is turned off.
The relay X2 is energized. When the normally closed contact x2 of the second relay X2 is turned off for a second set time, the third relay X2 is turned off.
3 is cut off, and the normally open contact x3 of the third relay X3 is turned off, so that R-c is opened and the electric valve 8 is closed, while the second normally open contact x2 of the second relay X2 is closed. By turning on for a set time, the fourth relay X4 and the fourth timer TX
Fourth, the fifth timer TX5 is energized, and the energized state of the fourth relay X4 is maintained by turning on the normally open contact x4 of the fourth relay X4. When the fourth set time has elapsed after the energization of the fourth timer TX4, the normally open contact Tx4 of the fourth timer TX4
Is turned on, when the pressure switch 10 is turned on, the fifth relay X5 is energized, and the fifth timer TX
No. 5 normally closed contact Tx5 turns off when the fifth set time has elapsed after energization. It is waiting in the above state. (4) When the pressure switch 10 is turned on, the fifth relay X
5 is energized, and the normally open contact x5 is turned on, so that the third relay X3 and the third timer TX3 are energized, and the third relay X
By turning on the normally open contact x3 of No. 3, R-c is closed, the electric valve 8 is opened, and their energized state is maintained. On the other hand, when the third timer TX3 is turned off when the third set time has elapsed after the normally closed contact Tx3 is energized, the fourth timer TX3 is turned off.
The energization of the relay X4, the fourth timer TX4, and the fifth timer TX5 is cut off. (5A) When the flow switch 11 is turned off in the state of (4), the normally open contact x6 of the sixth relay X6 is turned on while the normally open contact Tx3 of the third timer TX3 is on. 10 relay X10 and second timer T
When M2 is energized and the normally open contact x10 of the tenth relay X10 is turned on, their energized state is maintained. (6-1) When the flow switch 11 is turned on before the time measurement by the second timer TM2 is completed, the sixth
The relay X6 is energized, and the normally open contact x of the sixth relay X6
6, the eleventh relay X11 and the third timer T
M3 is energized, the energized state thereof is maintained by turning on the normally open contact x11 of the eleventh relay X11, and is turned off after a lapse of a set time from energization of the normally closed contact Tm3 of the third timer TM3. And the second timer TM2
When the normally open contact Tm3 is turned on and the normally open contact Tm3 is turned on, the eighth timer TX8 is energized, and the twelfth relay X12 is turned on until the eighth set time elapses from the energization and the normally closed contact Tx8 of the eighth timer TX8 is turned off. Is energized. The twelfth relay X
When the normally closed contact x12 is turned off for the twelfth set time, the motor-operated valve 8 is closed in the same manner as in (2) and (3) described above, and enters a standby state. (6-2) On the other hand, if the timing of the second timer TM2 is completed before the flow switch 11 is turned on, the normally open contact Tm2 of the second timer TM2 is turned on, and the thirteenth relay X
The thirteenth and ninth timers TX9 are energized and the thirteenth relay X1
When the normally closed contact x13 of 3 is turned off, R-c opens, and the motor-operated valve 8 is closed, and when the normally closed contact x13 is turned on, the buzzer 15a and the lamp 15b are operated. (5B) If the flow switch 11 remains on in the state of (4), the seventh relay X7 is energized by turning on the normally open contact x6 of the sixth relay X6, and the normally open contact x of the seventh relay X7 is turned on.
By turning on 7, the energized state of the seventh relay X7 is maintained, the sixth timer TX6 is energized, and the normally-closed contact Tx6 of the sixth timer TX6 is turned off after the sixth set time has elapsed since energization. The eighth relay X8 is energized.
The counter C is energized by turning on the normally open contact x8 of the eighth relay X8 for the sixth set time. If the set number n ₀ has not yet been counted up, the first timer T6 is turned on by turning on the normally open contact Tx6 of the sixth timer TX6.
When M1 is energized and the flow switch 11 is turned off while the set time is being measured by the first timer TM1, the flow shifts to (5A). Conversely, while the flow is being measured by the first timer TM1, the flow is stopped. When the switch 11 is kept on, the seventh timer TX7 is energized by turning on the normally open contact Tm1 of the first timer TM1, and the seventh timer
The ninth relay X9 is energized until the normally closed contact Tx7 of the seventh timer TX7 is turned off after the set time elapses, and the third relay X3 is turned off by turning off the normally closed contact x9 for the seventh set time.
And the energization of the third timer TX3 is cut off, R-c is opened, the electric valve 8 is closed, and the normally open contact x9 and the normally closed contact Tx3 are turned on, so that the fourth relay X4 and the fourth timer TX are turned on.
4. The fifth timer TX5 is energized and enters the standby state shown in (3) above. On the other hand, when the set number of times n ₀ has been counted up, the thirteenth relay X13 and the ninth timer TX9 are energized by turning on the count-up normally open contact Cx, and the electric valve is operated in the same manner as in (6-2). 8, the buzzer 15a and the lamp 15b operate.

In the above embodiment, the sequence is controlled. However, the present invention may be controlled using a microcomputer. The water supply pipe 3 according to the present invention is used for supplying not only cold water such as tap water but also hot water for hot water supply.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a block diagram

FIG. 2 Piping system diagram

FIG. 3 is a flowchart.

FIG. 4 is a sequence circuit diagram.

FIG. 5 is a sequence circuit diagram.

FIG. 6 is a sequence circuit diagram.

[Explanation of symbols]

 2 faucet 3 water supply pipe 8 drive valve 10 pressure sensor 11 flow sensor 12 valve control unit 13 first water leak judgment unit 14 second water leak judgment unit

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takeshi Inoue 3-15 Akebonocho, Toyota-shi, Aichi Pref. Kaihei 3-108630 (JP, A) Jiko 1-25302 (JP, Y2) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01M 3/00-3/40

Claims (3)

(57) [Claims] A drive valve (8) is interposed in a water supply pipe (3) to a faucet (2), and a drive valve (8) of the water supply pipe (3) is provided.
A pressure sensor (10) and a flow rate sensor (11) for detecting a pressure and a flow rate in the pipe in a portion between the pipe and the faucet (2);
Said pressure sensor (10) to open to actuate the drive valve (8) when the detected pressure (P) is less than the set pressure (P ₀₎ of, and the detected pressure (P) is the set of the pressure sensor (10) A valve control unit (12) for closing the drive valve (8) when the pressure is equal to or higher than the pressure (P ₀ ), and a flow rate detected by the flow sensor (11) when the drive valve (8) is open. (Q)
And a first leak determining unit (13) for outputting a leak detection signal when the flow rate is less than a set flow rate (Q ₀ ) which is a minimum flow rate at the time of water supply accompanying opening of the faucet . 2. A drive valve (8) is interposed in a water supply pipe (3) to a faucet (2), and a drive valve (8) of the water supply pipe (3) is provided.
A pressure sensor (10) and a flow rate sensor (11) for detecting a pressure and a flow rate in the pipe in a portion between the pipe and the faucet (2);
Said pressure sensor (10) to open to actuate the drive valve (8) when the detected pressure (P) is less than the set pressure (P ₀₎ of, and the detected pressure (P) is the set of the pressure sensor (10) A valve control unit (12) for closing the drive valve (8) when the pressure is equal to or higher than the pressure (P ₀ ); and a flow rate detected by the flow rate sensor (11) when the drive valve (8) is open. Q)
Minimum flow rate at the time of water supply with the opening of the faucet for a set time (T ₂ ) longer than the time of water supply with the operation of the opening of the faucet
And a second water leakage determination unit (14) for outputting a water leakage detection signal when the flow rate is maintained at or above a set flow rate (Q ₀ ). 3. A drive valve (8) is interposed in a water supply pipe (3) to a faucet (2), and a drive valve (8) of the water supply pipe (3) is provided.
A pressure sensor (10) and a flow rate sensor (11) for detecting a pressure and a flow rate in the pipe in a portion between the pipe and the faucet (2);
Said pressure sensor (10) to open to actuate the drive valve (8) when the detected pressure (P) is less than the set pressure (P ₀₎ of, and the detected pressure (P) is the set of the pressure sensor (10) A valve control unit (12) for closing the drive valve (8) when the pressure is equal to or higher than the pressure (P ₀ ), and a flow rate detected by the flow sensor (11) when the drive valve (8) is open. (Q)
When the pressure is less than a set flow rate (Q ₀ ), which is a minimum flow rate at the time of water supply accompanying the opening operation of the faucet , a first water leakage determination unit (13) that outputs a water leakage detection signal and the drive valve (8) are opened. open the in and has state detection flow of the flow rate sensor (11) (Q) is faucet
A second water leak judging section (14) for outputting a water leak detection signal when the flow rate is maintained at a set flow rate (Q ₀ ) or more over a set time (T ₂ ) longer than a feed water use time accompanying operation. Water leak detection device.