JP2000258201A - Water supply meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water supply meter having a flow rate adjustable mechanism. SOLUTION: A water supply meter 1 comprises a flow rate detector 2, a flow rate controller 3 and a control unit 4. The flow rate controller 3 comprises a valve element 34 capable of opening/closing a passage opening 32 and a stepping motor 35 for driving the valve element 34 to open/close. The control unit 4 controls the drive of the stepping motor 35. Based on e.g. the water pressure detected by a pressure sensor 27, the opening of the valve element 34 is controlled to realize a water supply not influenced by the water pressure variation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water meter, and more particularly, to a water motor having a flow control mechanism.

[0002]

2. Description of the Related Art A conventional water meter is used only for detecting a flow rate, and a flow rate adjusting valve, a water shutoff valve, and the like, which are separately attached to a water pipe, for adjusting a flow rate, opening and closing a pipeline, and preventing backflow. , A check valve or the like.

When water is supplied at a higher supply pressure than necessary for a lowland in order to secure a water supply pressure in a highland or the like, a flow control valve or the like is provided in a lowland water supply pipe to suppress the flow rate. Is attached.

Further, at the time of saving water or restricting the supply of water, a method of reducing the flow rate by replacing the hole diameter of the packing attached to the water meter with a smaller one is adopted.

On the other hand, in recent years, a system for centrally monitoring the state of use of water and the like in each home via a communication line has been used.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to propose a water meter which has not only a flow rate detection function but also a flow rate adjustment function and a pipe opening / closing function, and is suitable for use in a centralized monitoring system. It is in.

[0007]

The water meter according to the present invention comprises:
It has a flow detection unit attached to the pipe, and a flow control mechanism arranged upstream or downstream in the water flow direction with respect to the flow detection unit, and the flow control mechanism includes a valve unit and the valve unit. It is characterized by having a motor for driving, and valve control means for controlling the drive of the motor and causing the valve means to perform at least one of opening and closing of a pipeline and flow rate adjustment.

[0008] Here, it is desirable to use a stepping motor for easily positioning the rotation angle as the motor.

It is also conceivable to perform stepwise control using one or more solenoids.

When a stepping motor is used, the opening of the valve means can be detected by counting the number of driving pulses.

The drive control of the valve means can be performed based on the water pressure. In this case, a pressure sensor for detecting the water pressure in the water pipe may be provided, and the valve control means may drive and control the valve means based on the output of the pressure sensor.

According to this configuration, for example, when the water supply pressure is high in a lowland or the like, the flow rate can be automatically adjusted. Similarly, when the water supply pressure is low, such as during water saving, the flow rate can be automatically reduced.

[0013] Furthermore, a water-cut state can be detected based on the output of the pressure sensor. That is, when the water pressure is abnormally decreased, it can be determined that the water cutoff state occurs. In this case, if the abnormal state is automatically notified to the monitoring center via the communication line, it becomes possible for the monitoring center to take necessary measures before the water outage occurs.

The drive control of the valve means can be performed based on time. In this case, a timer function may be provided, and the valve control means may drive and control the valve means based on a timer count by the timer function. For example, like a calendar timer, the flow control status can be programmed in advance in units of hours, days, weeks, or months.

The drive control of the valve means can be performed based on the flow rate. For example, if the flow rate is large, make it fully open,
Conversely, if the flow rate is small, reducing the flow rate has advantages such as reducing the flow rate adjustment amount at the faucet.

Here, since the driving force of the valve means by the motor is generally small, in order to reliably drive the valve means, a reduction mechanism having a large reduction ratio is connected between the valve means and the output shaft of the motor. I just need.

Alternatively, a solenoid may be provided which generates an auxiliary driving force for opening and closing the valve means.

Alternatively, if the valve means is of a pilot type, the diameter of the pipeline to be opened / closed by the valve means is small, so that the valve means can be reliably driven by the motor output.

Instead of taking such measures, the following configuration can be adopted. That is, the first and second pipe portions are formed in the portion of the flowing water pipe opened and closed by the valve means. A first valve means capable of moving in the first flowing direction to close the pipe is disposed in the first pipe section, and a second valve section is arranged in a direction opposite to the first flowing direction in the second pipe section. And a second valve means capable of closing the pipe is arranged. Also, the first
By controlling the second valve means and the second valve means individually by the valve control means, a full open state, a fully closed state and a half open state of the water pipe are formed.

For example, when water is flowing in the first flowing direction, the first valve means capable of moving in the same direction to close the first pipe portion is driven to open the flowing pipe halfway. May be formed. Since only a small force is required to drive the first valve means in the flowing water direction, such driving can be easily realized even when a battery-driven stepping motor is used.

Next, in the case where the valve means driven by such a motor is provided, the valve means may be stopped due to a failure of the motor, a failure of the valve control means, or the like.
In such a case, in order to be able to shut off the pipeline by manual operation, it is desirable to dispose a water stopcock that can forcibly shut off the pipeline regardless of the state of the valve means.

Conversely, in such a case, in order to be able to secure the water supply by manual operation, it is necessary to arrange a faucet that can forcibly open the pipeline regardless of the state of the valve means. desirable.

On the other hand, the present invention is characterized in that it further comprises a cleaning means for cleaning a valve seat on which the valve means is seated. With long-term use, scales adhere to the valve seat and the valve means, and if other dirt adheres to the scales, it causes water leakage or the like. In order to remove such water scale and dust, the valve means and the valve seat may be rubbed. Alternatively, a portion that generates vortex and cavitation in the water flow, such as a projection, may be provided in the water channel.

Next, the water meter configured as described above opens and closes the running water pipe by means of a motor. Therefore, if an abnormality occurs in the motor drive power supply and the supply of drive power stops, the water meter stops operating. Therefore, it is desirable to arrange a power sensor that monitors the driving power and detects that the driving power has dropped below a predetermined value, and in such a case, it is desirable to forcibly switch the flowing water pipe to the fully open state. In this way, water supply can always be ensured.
The case where the driving power is reduced includes running out of a battery, a power failure, a short circuit and the like. Further, in this case, it is preferable that the monitoring center be notified of the forcible switching to the fully open state via the communication line.

Next, the present invention relates to a water meter centralized monitoring system, comprising a water meter provided with the above-described valve means, a monitoring center for centrally monitoring the water meter, and a water meter. A transmission device for notifying the centralized center via a communication line of information such as a result of meter reading and the state of the valve means, and receiving a command from the monitoring center.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A water meter to which the present invention is applied will be described below with reference to the drawings.

FIG. 1 is a schematic sectional view of a water meter according to one embodiment of the present invention. Describing with reference to this figure, the water meter 1 of the present example includes a flow detection unit 2 and a flow control unit 3.
And a control unit 4. Flow rate detector 2
Is a cylindrical water pipe section 21 and a strainer 2 arranged inside the water pipe section 21 from the upstream side to the downstream side of the water flow.
2, a rectifier 23, an impeller 24, and a magnetic sensor unit 25.

The impeller 24 is of an axial flow type, and a magnet 24 a is attached to an end face on the downstream side. A rotating magnetic field generated by the magnet 24 a rotating with the impeller 24 is detected by a magnetic sensor unit 25. Then, based on the detection result, the control unit 4 calculates the flow rate flowing through the water pipe section 21.

A pressure outlet 26 is opened at a position downstream of the flow rate detector 2 in the flowing water pipe portion 21, and a water pressure taken in through the pressure outlet 26 is detected by a pressure sensor 27.

The flow control unit 3 connected to the downstream side of the water pipe section 21 defines an upstream end opening 32 of the small diameter water pipe section 31 inserted into the downstream side of the water pipe section 21. It has an annular valve seat 33, a disc-shaped valve element 34 capable of opening and closing the opening 32, and a stepping motor 35 for driving the valve element 34 to open and close. The figure shows a state where the opening 32 is closed by the valve element 34.

FIG. 2 is an explanatory diagram showing the configuration of the flow control unit 3 and the control unit 4. Referring to this figure, the stepping motor 35 of the flow control unit 3 is a general one, and includes a motor case 35a, a stator 35b attached to the inner peripheral surface thereof, and a motor output shaft 3
Rotor magnet 35d integrated with the outer periphery of 5c
It is composed of A screw screw 35e is formed on the outer peripheral surface of the distal end portion of the motor output shaft 35c.
The valve body 34 includes a disc-shaped valve main body 34a and a cylinder 34b attached to the back surface thereof. At the end of the cylinder 34b, a nut portion 34c that meshes with a screw screw 35e is formed. The valve element 34 is always pushed by the coil spring 36 toward the valve seat 33.

When the stepping motor 35 is driven to rotate, the valve element 34 meshing with the output shaft 35c reciprocates in the axial direction of the output shaft 35c. In the present example, reciprocation is possible between a fully open position A shown by a solid line in FIG. 2 and a fully closed position B shown by an imaginary line pressed against the valve seat 33.

The control unit 4 has a control unit 41 constituted by a microcomputer, to which a detection signal from the flow sensor unit 25 and a detection signal from the pressure sensor 27 are input. Various commands can be input via the setting unit 42. The control unit 41 calculates the flow rate and the water pressure based on the input detection signal, and
3 is displayed. Further, the control unit 41 includes a motor driver 44.
The opening degree of the valve body 34 is controlled by controlling the driving of the stepping motor 35 via the control unit. Motor driver 44
Is output to the control unit 41, and the control unit 41 calculates the opening of the valve body 34 by counting the drive pulses. The calculated opening degree can be displayed via the display unit 43.

The control unit 4 is connected to the transmission device 5 and controls the flow rate, pressure,
Information such as the valve opening can be transmitted from the transmission device 5 to the remote centralized monitoring center 7 via the communication line 6. In the centralized monitoring center 7, various commands,
Information and the like can be supplied to the control unit 4 via the communication rotation 7 and the transmission device 5.

The water meter 1 of this embodiment having the above-described configuration includes the flow control unit 3, and the flow control unit 3 can adjust the opening of the valve body 34 by the stepping motor 35. Therefore, the flow rate can be controlled accurately.
In addition, control such as reducing the flow rate during water saving can be easily realized.

Further, various flow control can be automatically performed according to the water supply condition and the like. For example, pressure sensor 2
Based on the water pressure obtained in step 7, when the supply water pressure is low, the valve can be fully opened, and when the supply water pressure is too high, control such as reducing the flow rate can be performed. Further, the supply of water to the valve can be interrupted based on the detected flow rate.
For example, when the flow rate is abnormally high for a long time, it is determined that some abnormality has occurred, and control such as shutting off the water supply can be performed. In addition, the opening degree of the valve can be adjusted by the control unit 41 of the control unit 4 in accordance with a preset program.

Further, when the water pressure drops abnormally based on the detection result of the pressure sensor 27, it may be determined that the water supply has been cut off, and this determination result may be reported to the monitoring center 7. Of course, the monitoring center 7 may determine whether or not a water-cut state has occurred based on the water pressure information received via the communication line. It is convenient to perform the identification of the water cutoff state in this way, because it is possible to quickly take a precautionary measure before the water cutoff occurs.

Further, as shown by an imaginary line in FIG. 2, the motor drive power supplied from the motor drive power supply circuit 45 is monitored, and when the power drops below a predetermined value, the control unit is controlled. It is desirable to forcibly switch the valve to the fully open state at 41 and stop the motor drive. In this way, for example, when the battery runs out or at the time of a power failure, it is possible to avoid a problem that the valve cannot be opened in a closed state and water cannot be supplied. For monitoring the motor driving power, a voltage or current sensor may be used.

It is desirable that such an abnormal state be reported to the monitoring center 7 via the transmission device 5. The monitoring center 7 can quickly take measures for post-processing such as battery replacement.

As described above, if the water meter 1 of this embodiment is adopted, the so-called intelligent water meter can be easily realized.

(First Modification of Flow Control Unit) Here, the valve driving force of the stepping motor 35 is not so large. This is especially true in the case of battery drive.

Accordingly, in order to ensure that the opening and closing drive of the valve body 34 is performed with a small driving force, a speed reduction mechanism having a large reduction ratio is connected between the output shaft 35c of the stepping motor 35 and the valve body 34. It is desirable. In this case, the operating speed of the valve body decreases, but the driving force can be greatly increased.

Instead of employing a speed reduction mechanism, a drive mechanism having a solenoid can be employed as shown in FIG. Referring to FIG. 3, the valve drive mechanism shown here includes a stepping motor 135 and an electromagnetic solenoid 8. Output shaft 135c formed with screw screw 135e connected to valve body 134
Is an output shaft of the stepping motor 135 and an operating rod 8a of the electromagnetic solenoid 8. Accordingly, the output shaft 135c receives a rotational force from the stepping motor 135 and a driving force from the electromagnetic solenoid 8 in the valve opening / closing direction.

The drive control unit 9 of the stepping motor 135 and the electromagnetic solenoid 8 generates a driving force that assists the driving force of the valve element by the stepping motor 135 during the movement of the valve element requiring the greatest driving force. By driving the electromagnetic solenoid 8 in such a manner, the driving of the valve element 134 can be performed smoothly and reliably. As a result, it is possible to accurately control the flow rate by adjusting the opening degree of the valve element 134.

(Second Modification of Flow Control Unit) In order to open and close the valve body with a small driving force, a pilot-type valve mechanism may be employed. FIGS. 4A and 4B show a flow rate adjusting section provided with a pilot-type valve mechanism. The flow control unit 3A includes a diaphragm valve 234 as a valve body, and the opening and closing of the opening 32 is performed by the diaphragm valve 234.

The valve element 234a of the diaphragm valve 234 is attached to the diaphragm 234b, and the diaphragm 234b is connected to the pressure chamber 11 where the water pressure on the water inflow side acts.
And the inside 31a of the small-diameter flowing water pipe portion 31 on the water outflow side
And partition. The pressure chamber 11 communicates with the water inflow side and the water outflow side 31 via the pilot valve 236.
It is possible to communicate with a. The pilot valve 236 is opened and closed by a stepping motor 235 having the same configuration as the stepping motor shown in FIGS.

Normally, the pilot valve 236 is open,
Therefore, the pressure chamber 11 is in a low pressure state on the water outflow side. As a result, as can be seen from the figure, the diaphragm valve 234 is separated from the valve seat 33 and pushed up by the water pressure on the inflow side, and the opening 32 is held in the fully opened state. Therefore, a flowing water state (water supply state) is formed.

When the pilot valve 236 is closed, the pressure chamber 1
Since 1 is in a high pressure state on the water inflow side, it is pressed against the valve seat 33 to be in a state shown in FIG. As a result, the opening 3
2 is fully closed, and the water supply is shut off.

Here, when the drive mechanism of the pilot valve 236 fails for some reason and stops operating, it is necessary to forcibly supply or shut off water. For this reason, in the flow control mechanism 3A of this example,
A manual water shutoff valve 12 capable of manually forcibly closing the diaphragm valve 234 is attached. The manual water shutoff valve 12 can adjust the opening degree of the diaphragm valve 234 by closing the diaphragm valve 234 and adjusting the screwing amount of the screwed portion 12a, that is, the pressing amount of the diaphragm valve 234. It functions as a simple flow adjustment mechanism.

Further, in this embodiment, the manual water discharge valve 13 capable of forcibly opening the diaphragm valve 234 when the pilot valve 236 stops operating due to a failure or the like is attached. By opening the manual water discharge valve 13, it is possible to bypass the pilot valve 236 and communicate the pressure chamber 11 with the low-pressure water outflow side.

The flow rate adjusting section 3A of the present embodiment thus configured
According to the method, the pilot valve is driven by the stepping motor, so that the water supply passage can be opened and closed with a relatively small driving force.

Also, since a manual water stop valve and a manual water discharge valve are provided, when the stepping motor fails, etc.
Water supply can be started and water supply can be shut off as necessary, which is advantageous in terms of safety and convenience.

Further, the opening of the diaphragm valve can be adjusted by adjusting the manual water shutoff valve. As a result, there is an advantage that the flow rate can be adjusted to some extent.

(Third Modification of Flow Control Unit) As a mechanism for adjusting the flow when it is not necessary to fully open and close the pipeline, as shown in FIG. 5, the tip is pointed in a conical shape. A mechanism that drives the cylindrical valve element in a direction perpendicular to the pipeline by a stepping motor can be used. By adjusting the insertion amount of the valve element, the pipe area can be changed, and as a result, the flow rate can be adjusted.

(Fourth Modification of Flow Control Unit) FIG.
It is explanatory drawing which shows the principal part of another example of a flow control part. As shown in the figure, first and second pipe portions 401 and 402 having the same inner diameter are formed in a flowing water pipe portion to which a flow control unit is attached. The opening 33A on one end side of the first conduit portion 401 can be opened and closed by a first valve body 434A. That is, the first valve body 43
4A moves in the first water flow direction to form an annular valve seat 33A.
And the first conduit portion 401 can be closed.

On the other hand, in the second conduit portion 402, the opening 33B on the opposite side can be opened and closed by the second valve body 434B. That is, the second valve body 43
4B moves in the direction opposite to the first water flow direction, and is seated on the annular valve member 33B so as to be able to close off the second pipe portion 402.

The first and second valve bodies 434A, 434A,
34B is driven by a single or individual stepper motor (not shown).

By individually driving these valve elements, the water pipe can be fully opened, fully closed and half-open.
An example of the drive control sequence is summarized as a list in FIG. As shown in this figure, the state is such that the first valve body is open and the second valve body is closed, and the whole state is a half-open state. In the state, both valve bodies are closed and the whole is in a fully closed state. The state is such that the first valve body is closed and the second valve body is open, and the whole is in a half-open state. The state is that both valve bodies are open and the whole is in a fully open state.

In the switching operation between the states, two valve bodies are not driven at the same time, and only one valve body is always opened and closed. If the water flow direction is the direction shown in FIG. 7A, and if the initial state is a half-open state of the state, in order to form a fully closed state (state),
Since the first valve element only needs to be moved in the water flow direction, such a closing operation can be performed with a small driving force. Also,
Even when the state is switched from the half-open state to the fully-open state, the second valve body may be moved in the water flow direction, so that the opening operation can be performed with a small driving force.

Here, when switching from the fully open state to the half open state, it is necessary to close the second valve body against the water flow. But in this case,
Since the other first valve element is open, not much driving force is required.

The same applies to the case where the water flow direction is opposite, and the flow control can be realized with a small valve driving force.

(Valve Seat Cleaning Mechanism) Next, FIG.
FIG. 4 shows a modification of the valve drive unit of the flow control unit 3 shown in FIGS. 1 and 2 and includes a valve seat cleaning mechanism.

That is, the valve body 334 has a disc-shaped valve body 334a and a cylinder 334b attached to the back surface thereof.
And a stepping motor 3 at the end of the cylinder 334b.
A nut portion 334c screwed into a screw screw 335e formed on the outer peripheral surface of the distal end of the 35 output shaft 335c is formed. Such a configuration is the same as the example shown in FIGS.

In this embodiment, however, the valve body 334a of the valve body 334 is rotatably attached to the cylinder 334b, and the mainspring 336 is connected between them. Although the cylinder 334b is normally held so as not to rotate, an external gear 337 is formed on the outer peripheral surface thereof. The external gear 337 is connected to a motor 339 via a reduction mechanism 338. I have. The motor 339 is slidable in the valve moving direction with respect to the fixed portion 340 via the slide mechanism 341.

In the valve body driving mechanism having this configuration, the stepping motor 335 is driven to move the valve body 334 to the valve seat 33.
, The motor 339 is driven to rotate the cylinder 334b. The valve body 334a does not rotate because it is pressed against the valve seat 33. As a result, the mainspring 336 connected between them is wound.

When the stepping motor 335 is driven in the direction to open the valve body 334 and the pressing force for pressing the valve body 334a against the valve seat 33 is loosened, the elastic return force of the wound mainspring 336 wins, and the valve body 334 is overcome. The 334 rotates while contacting the valve seat 33. By this rotation, the valve seat 3
Water scale, dust, and the like adhering to the surface of No. 3 are removed. At the same time, the surface of the valve body 334 also rubs against the valve seat 33, and scales, dust, and the like adhering thereto are removed.

As described above, according to the mechanism of this embodiment, the valve 3
When the valve 34 is opened, the valve body and the valve seat rub against each other, so that water scale and dust adhering to their surfaces are removed. Therefore, the valve body 33 is caused by the attached scale, dust and the like.
4 can be prevented from being adversely affected by incomplete blockade by 4 and water leakage or the like.

As the valve seat cleaning mechanism, a mechanism in which a vortex or cavitation is generated in the water flow on the inner peripheral surface of the pipe near the valve seat may be used.

[0069]

As described above, according to the water meter of the present invention, there is provided a flow control mechanism provided with a valve element which can be driven by a motor such as a stepping motor. Therefore, according to the present invention, water supply control based on the detected flow rate,
Various flow control such as flow control based on feedwater pressure can be easily realized.

When a stepping motor is used, the adjustment of the opening of the valve body is easy, and as a result, the flow rate can be adjusted with high accuracy. Furthermore, since the opening degree of the valve body can be detected by counting the number of drive pulses of the stepping motor, the flow rate can be easily controlled.

Next, the present invention employs a structure in which a motor and a solenoid are used together to connect a speed reduction mechanism between the valve means and the output shaft of the motor, or to drive the valve means. Alternatively, the valve means is of a pilot type. By employing such a configuration, it is possible to reliably and smoothly open and close the valve means even when a drive source having a relatively small driving force such as a stepping motor is used.

In addition, by adopting a structure in which the first and second valve bodies moving in opposite directions are individually opened and closed, smooth flow control by a motor having a small driving force can be realized.

On the other hand, according to the present invention, there is provided a water stopcock which can forcibly shut off the pipeline and a water tap which can forcibly open the pipeline irrespective of the state of the flow rate control section comprising a stepping motor or the like. Configuration. By employing this configuration, even when the stepping motor does not operate due to a failure or the like, water supply can be started and water supply can be shut off.

Next, the present invention employs a structure provided with a cleaning means for cleaning the valve seat on which the valve means is seated. By adopting this configuration, it is possible to prevent the adverse effect that water scale, dust, and the like adhere to the valve means and the like and cause water leakage or the like.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of a water meter to which the present invention is applied.

FIG. 2 is an explanatory view showing a main part of the water meter shown in FIG.

FIG. 3 is an explanatory diagram showing a modified example of a valve drive mechanism in the flow control unit of the water meter in FIG. 1;

FIG. 4 is a schematic longitudinal sectional view and a schematic transverse sectional view showing a modification of the flow rate control unit of the water meter in FIG. 1;

FIG. 5 is an explanatory view showing an example of a valve body for adjusting a flow rate.

FIG. 6 is an explanatory diagram illustrating an example of a valve seat cleaning mechanism.

FIG. 7 is a schematic configuration diagram showing a modification of the flow control unit and an explanatory diagram showing a control state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water meter 2 Flow detection part 3 Flow control part 4 Control unit 27 Pressure sensor 32 Opening 33 Valve seat 34 Valve element 35 Stepping motor 41 Control part 43 Display part 45 Power supply circuit 5 Transmission device 6 Communication line 7 Centralized monitoring center 8 Electromagnetic solenoid

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshio Murakami 3967-10, Wada, Matsumoto-shi, Nagano F-term in Toyo Keiki Co., Ltd. (reference) 2F030 CA01 CC02 CE09 CE12 CF05 CF08 CG01 2F073 AA07 AB01 BB09 BC01 CC01 DD02

Claims (19)

[Claims] 1. A flow detecting device comprising: a flow detecting unit attached to a flowing water pipe; and a flow control mechanism disposed upstream or downstream in a water flow direction with respect to the flow detecting unit.
Valve means, a motor for driving the valve means, and valve control means for controlling the drive of the motor to cause the valve means to perform at least one of opening / closing of a pipeline and flow rate adjustment. Water meter characterized by the following. 2. The water meter according to claim 1, wherein the motor is a stepping motor. 3. The valve control unit according to claim 2, wherein the valve control unit includes an opening detection unit that detects the opening of the valve unit by counting the number of driving pulses of the stepping motor. Water motor. 4. The apparatus according to claim 1, further comprising: a pressure sensor that detects a water pressure in the water pipe, wherein the valve control unit is configured to output the pressure sensor based on an output of the pressure sensor. A water meter characterized in that the valve means is driven and controlled. 5. The apparatus according to claim 1, further comprising a timer function, wherein the valve control means controls the driving of the valve means based on a timer count by the timer function. Water meter characterized by the following. 6. The water meter according to claim 1, wherein the valve control unit drives and controls the valve unit based on an output of the flow rate detection unit. 7. The water meter according to claim 1, wherein a speed reduction mechanism is connected between the valve means and an output shaft of the motor. 8. The water meter according to claim 1, further comprising a solenoid that generates an auxiliary driving force for opening and closing the valve means. 9. The water meter according to claim 1, wherein the valve means is of a pilot type. 10. The method according to claim 1, further comprising a water stopcock capable of forcibly shutting off a pipeline regardless of a state of the valve means. Characterized water meter. 11. A water tap according to claim 1, further comprising a water tap capable of forcibly opening a pipe regardless of a state of said valve means. And water meter. 12. The water meter according to claim 1, further comprising a cleaning unit for cleaning a valve seat of the valve unit. 13. The water meter according to claim 12, wherein the cleaning means rubs the valve means with the valve seat when the valve means separates from the valve seat. 14. A part according to claim 12, wherein said cleaning means generates a vortex and cavitation in a water flow such as a projection formed on an inner peripheral surface portion of a pipe located near said valve seat. A water meter characterized by comprising: 15. A water meter according to claim 1, a monitoring center for centrally monitoring said water meter, a result of meter reading of said water meter, and a state of said valve means. And other information via a communication line.
A transmission device for notifying the centralized center and receiving a command from the monitoring center. 16. The water meter according to claim 4, wherein a water cutoff state is determined based on an output of the pressure sensor. 17. The water meter according to claim 16, a monitoring center for centrally monitoring the water meter, a meter reading result of the water meter, a state of the valve means, and detection information of the pressure sensor. Including a transmission device for notifying the centralized center via a communication line and receiving a command from the monitoring center, wherein the monitoring center is based on detection information of the pressure sensor,
A monitoring system for a water meter, which determines whether or not a water outage has occurred. 18. The water pipe according to claim 1, wherein a first and a second pipe portion are formed in a portion of the water pipe opened and closed by the valve means. A first valve means capable of moving in the first flowing direction to close the pipe is disposed in the pipe section of the second pipe section, and the second pipe section is arranged in the direction opposite to the first flowing water direction. A second valve means that can move and close the pipe line is disposed, and the valve control means controls the first and second valve means individually so that the water pipe is fully opened. A water meter that forms a fully closed state and a half open state. 19. The motor according to claim 1, further comprising: a power sensor for monitoring a supply state of the drive power of the motor, wherein the valve control means controls the drive power by the power sensor. The water meter is characterized in that when it is detected that it has dropped below the value, the pipe line is forcibly held in a fully open state.