JP2000328611A - Water supply control unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent beforehand polluted water from being supplied to delivery ends, water supply pumps, pressure tanks to eliminate much loss. SOLUTION: This water supply control unit 1 controls water supply in the upstream pipe 7 of delivery ends positioned in the upstream side of delivery ends 6 and it is provided with a detector for water supply condition installed in the upstream side pipe 7 of the delivery ends, a drain pipe 12 connected to the upstream pipe 7, an on/off valve 13 usually closed and provided in the drain pipe 12, and a water supply control device 10 which judges whether the water supplying condition is under a suspension condition or not on the basis of a detected signal of the water supply condition detector 11 and opens the on/off valve 13 when it judges that water supply is suspended and drains water for a specified time interval from the drain pipe 12 after restoration of water supply, and thereafter, closes the valve 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply control unit for controlling water supply at a pipe upstream of a water supply destination located upstream of (in front of) a water supply destination. The present invention relates to a water supply control unit that controls not to supply contaminated water when it becomes water.

[0002]

2. Description of the Related Art Conventionally, when water in a water supply pipe becomes polluted water due to a water supply work, the contaminated water is sent to water supply destinations such as homes and factories, and tap water can be used at each water supply destination. The polluted water was discharged until it returned to its original state.

On the other hand, in the case of an apartment house, as a water supply system, there are a water supply system using an intensified water supply system and a water supply system using a water receiving tank. By driving a water supply pump, the above-mentioned contaminated water is sent to each household via a water supply pump. In the latter type of water supply to the receiving tank, water is supplied to each household through the receiving tank, and the polluted water is settled in the receiving tank or sent to each household through the receiving tank.

[0004]

However, as described above, when the contaminated water is sent to each supply destination, it is necessary to confirm that the contaminated water disappears in the discharge operation of the contaminated water at the supply destination. The operation was complicated, and the drainage operation was performed at many supply destinations, so that the operation was wasteful. In addition, when polluted water is sent to a supply destination, the water may be used erroneously, and there is a problem in hygiene.

[0005] In the case of the above-mentioned water supply system for an apartment house, when contaminated water enters the water supply pump, foreign matter of the contaminated water causes a malfunction of the mechanical seal and the like, and maintenance of the water supply pump and replacement of the water supply pump itself are required. Required, and extra work was required in addition to normal maintenance, and the cost for that was also required. Furthermore, when polluted water enters the receiving tank, it is necessary to replace all the water in the receiving tank, and as with the water supply pump, extraneous contamination other than normal maintenance is required due to contamination of the polluted water. Work was required, and the cost was also required.

[0006] The present invention has been proposed in view of the above,
To provide a water supply control unit capable of preventing polluted water from being sent to a water supply destination, a water supply pump, and a water receiving tank beforehand to always supply safe and clean water and to save a lot of waste. And

[0007]

According to a first aspect of the present invention, there is provided a water supply control unit for controlling water supply in a water supply destination upstream pipe located upstream of a water supply destination. The water supply state detection means provided in the water supply destination upstream pipe, the drain pipe connected to the water supply destination upstream pipe, the normally open / closed valve provided in the drain pipe, and the water supply state detection means Based on the detected detection signal, it is determined whether or not the water supply state is a water cutoff mode related to the water cutoff, and if it is determined that the water supply state is the water cutoff state, the on-off valve is opened and the water after the return of the water supply is drained for a predetermined time. A water supply control device for draining water from the pipe and thereafter returning the on-off valve to a closed state.

According to a fifth aspect of the present invention, there is provided a water supply control unit for controlling water supply in a water supply destination upstream pipe located upstream of a water supply destination, the water supply state detection provided in the water supply destination upstream pipe. Means, a drain pipe connected to the water supply upstream pipe, a normally open / closed valve provided on the drain pipe, and a second pollutant for detecting the degree of contamination of the feed water provided on the drain pipe. A detection sensor, determines whether or not the water supply state is a water-disruption mode related to water-disconnection based on the detection signal detected by the water-supply state detection unit, and opens the on-off valve when it is determined that the water-disconnection mode is present; A water supply control device that returns the on-off valve to a closed state when the water pollution degree detected by the second pollution degree detection sensor and returned from the drain pipe after the return of water supply becomes equal to or less than a second predetermined pollution degree; Characterized by having .

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a water supply control unit of the present invention and an entire configuration of a water supply system to which the water supply control unit is applied. In the figure, a pipe 7 branched from a water distribution small pipe 5 has a meter 7 in order from the upstream side.
1, a gate valve 72, a strainer 73, a pressure sensor 75, a check valve 74, and a water supply device 8 are arranged. Further downstream of the water supply device 8, for example, a water supply device 6 in each apartment house is provided as a water supply destination. Have been. The upstream side of the check valve 74 of the pipe 7 is a primary side piping system, and the downstream side is a secondary side piping system. The pressure sensor 75 detects the water pressure in the primary piping system of the piping 7.

The strainer 73 is provided in series with the pipe 7 so as to function as a filter, and that the water in the primary pipe system can be manually discharged from the branch pipe.

A water supply state detecting means 11 is provided between the gate valve 72 and the check valve 74 in the primary side piping system of the pipe 7, and a drain pipe 12 is connected to the pipe 7 by branching off from the pipe 7. The drain pipe 12 has an electric on-off valve 13 which is normally closed.
And a flow switch 14 for outputting an ON signal when a predetermined amount of water or more is detected. Then, the water supply state detecting means 11, the electric open / close valve 13 and the flow switch 14 are connected to the water supply control device 10, and the whole constitutes the water supply control unit 1 of the present invention.

The water supply control device 10 includes a CPU (not shown).
As described in detail below, according to a program according to the present invention stored in a ROM (not shown),
Judgment of the water interruption mode and control of polluted water discharge at the time of water supply after water interruption are performed.

The above-mentioned water supply device 8 is constituted by branching three lines of pipes 81, 82 and 83 in parallel from the pipe 7, and disposing various components to the pipes 81, 82 and 83. That is, in the pipe 81, in order from the pipe 7, the gate valve 81a, the water supply pump (booster) 81b, the flow switch 81c, the check valve 81d, and the gate valve 81e.
Are arranged in series, a check valve 82a is arranged in the pipe 82,
Similar to the pipe 81, the pipe 83 is sequentially arranged from the pipe 7 side.
A gate valve 83a, a water supply pump (booster) 83b, a flow switch 83c, a check valve 83d, and a gate valve 83e are arranged in series. Further, a pressure tank 85 and a pressure sensor 86 for detecting the water pressure at the downstream connection portion 84 are provided at the downstream connection portion 84 of the pipes 81, 82, 83. Further, a water supply pump 81b and a flow switch 81c of the pipe 81, a water supply pump 83b and a flow switch 83c of the pipe 83, a pressure sensor 86 at the downstream connection portion 84, and the above-described pressure sensor 75 of the primary side piping system are illustrated here. Connected to a control device (booster control panel) that is not connected.

The water supply device 8 includes a water supply pump 8
When the water supply device 6 is used in a state where 1b and 83b are stopped, water is supplied from the pressure tank 85, and the detection level of the pressure sensor 86 is reduced. It drives and supplies water to the water supply device 6 in each household.

The series of the pipe 81 and the series of the pipe 83 have the same configuration, and the two series having the same configuration are provided so that if one fails, the other can operate. It is.

In the water supply system from the meter 71 to the water supply device 6, which is provided by branching from the water distribution small pipe 5, the meter 71, the gate valve 72, the strainer 73, the check valve 74 and the water supply device 8 are usually used. , Water is supplied to the water supply device 6.

On the other hand, if there is water interruption in the water distribution pipe 5 due to water supply work or the like, the above-mentioned water supply control unit 1 operates as follows.

That is, the water supply control device 10 constantly monitors the detection signal sent from the water supply state detection means 11, and changes the water supply state in the pipe 7 due to the water cutoff, and detects the water supply state according to the change. When the detection signal from the means 11 changes, water is cut off based on the change in the detection signal.
It is determined whether the water is water-polluted, dusty, or water-polluted water, that is, the water supply state is related to water cut-off. Then, a command signal is output to the electric open / close valve 13 to open the electric open / close valve 13. Due to the opening of the electric on-off valve 13, the water remaining on the primary side from the meter 71 to the check valve 74 due to water cut-off is drained from the drain pipe 1.
2 is discharged.

Next, the water supply control device 10 monitors a detection signal from the flow switch 14. The polluted water supplied at the time of the return of the water supply after the interruption of the water supply is guided to the drain pipe 12 by the opening of the electric open / close valve 13 and is discharged. Then, the switch-on signal is output to the water supply control device 10 assuming that the water supply has been recovered. The water supply control device 10 continues to open the electric on-off valve 13 for a predetermined time (for example, 5 to 10 minutes) after receiving the switch-on signal, and thereafter returns the electric on-off valve 13 to the closed state. The predetermined time in this case is a time sufficient for the polluted water to be completely discharged when the water supply is restored after the water is cut off, and after the predetermined time has passed, the original usable tap water without contamination is pumped. Consider it to be. After the elapse of the predetermined time, when the electric on-off valve 13 is closed, the flow is switched from the drain pipe 12 to the normal pipe 7, and the primary pressure of the check valve 74 increases. Stop valve 7
4, the water enters the water supply device 8 from the check valve 74, is pressure-fed by the water supply pump 81 b, and is supplied to the water supply device 6.

As described above, in the water supply control unit 1 according to the present embodiment, when a water cutoff state (water cutoff state, pollution after water cutoff, dust, water polluted after water cutoff, etc.) is detected, the contaminated water flowing at the time of the subsequent water supply return is detected. Since the water is completely returned from the drain pipe 12 and returned to the normal water supply state, the polluted water can be prevented from being sent to each home, the water supply pump 81b, the pressure tank 85, etc. It can supply safe and clean water. In addition, unnecessary maintenance work for the water supply pump 81b, which has been conventionally required for discharging polluted water and contaminating contaminated water, becomes completely unnecessary, so that much waste including cost can be saved.

Next, a more specific configuration example of the water supply control unit 1 will be described with reference to FIGS.

FIG. 2 is a diagram showing a first configuration example of the water supply control unit. In the water supply control unit 1A according to the first configuration example, a pressure sensor 111 is employed for the water supply state detection unit 11 described above. In the first configuration example, the pressure sensor 111 is replaced with a pressure sensor 75 provided in the primary piping system. In this case, the pressure sensor 111 (75) is connected to the water supply control device 10 of the water supply control unit 1A, and is also connected to the control device that controls the entire water supply device 8 described above. Hereinafter, a control procedure executed by the water supply control device 10 when the pressure sensor 111 is used will be described with reference to FIG.

FIG. 3 is a flowchart showing a control procedure performed by the water supply control device in the first configuration example of the water supply control unit.

First, in step S1, the pressure sensor 111
Is detected at a predetermined pressure P0 (for example, 0.
It is determined whether the pressure is equal to or greater than 2 kg / cm 2). If the pressure is equal to or less than the predetermined pressure P0, it is determined that the water supply has been cut off and the water supply state is in a mode related to the water cutoff (water cutoff mode). If the pressure is equal to or higher than P0, it is determined that there is no interruption of the water supply, and the program is immediately terminated.

In the control device for controlling the water supply device 8 described above, the pressure sensor 111 (75) constantly monitors the water pressure in the primary piping system (water distribution small pipe side), and the water pressure is, for example, 0.7 kg / water pump 81 if it is higher than cm2
b for normal water supply control, and 0.7 kg / cm
2 or less, the water supply pump 81b is stopped, and once the water pressure drops to 0.7 kg / cm 2 or less, the next step is 1.
A series of controls in which the driving of the water supply pump 81b is not restarted until the pressure becomes 0 kg / cm2 or more is performed as a routine.

Therefore, under the situation where it is determined that the water supply is cut off in step S1, the water supply pump 81b is already stopped.

In step S2, a command signal for opening the electric on-off valve 13 (valve) is output, and the flow advances to the next step S3.

In step S3, it is determined whether or not a predetermined time T1 has elapsed since the opening / closing of the electric on-off valve 13. If the predetermined time T1 has not elapsed, the process stands by. If the predetermined time T1 has elapsed, the process proceeds to step S3. Proceed to the next step S4. Note that the predetermined time T1 in this case is, for example, 5 to 10 seconds. Since the water pressure is reduced due to water cutoff, the predetermined time T1 stays between the meter 71 and the check valve 74 before the check valve 74 (primary piping system). This is the time for draining water from the drain pipe 12.

In step S4, it is determined whether or not a switch-on signal has been input from the flow switch 14. If a switch-on signal has not been input, the process waits as it is, and when input, the process proceeds to the next step S5. . The flow switch 14 is turned on by detecting the amount of water supplied (for example, about 10 liters / minute) when returning to the water supply state after the interruption of water supply.

In step S5, a predetermined time T2 (for example, 5 to 10) after the primary pipe system returns to the water supply state after the water supply is cut off.
It is determined whether or not (minute) has elapsed. If the predetermined time T2 has not elapsed, the process stands by. If the predetermined time T2 has elapsed, the process proceeds to the next step S6. The predetermined time in this case is a time sufficient for the polluted water to be completely discharged when the water supply is restored after the interruption of the water supply, as described above.

In step S6, a command signal for closing the electric open / close valve 13 (valve) is output, and the flow advances to the next step S7.

In step S7, it is determined whether or not a switch-off signal has been sent from the flow switch 14 in accordance with the closing operation of the motor-operated on-off valve 13. This program is terminated as it is assuming that the polluted water discharge control has been performed, and if not, the process branches to step S8 as abnormal.

In step S8, an alarm is output, and thereafter, the process returns to step S6, and steps S6, S7, and S8 are repeatedly executed until the abnormality is eliminated by the operator.

When the motor-operated on-off valve 13 is closed in step S6, the flow is switched from the drain pipe 12 to the ordinary pipe 7 as described above, and the primary pressure of the check valve 74 is increased. Tap water passes through the check valve 74. And, in this case, the water pressure of the primary side piping system (water distribution small pipe side) is 1.0 kg / cm unless there is any abnormality.
2 or more, the control device of the water supply device 8 described above is
The driving of the water supply pump 81b is restarted, and the secondary side piping system is returned to the normal water supply state. In this way, even after the water supply is cut off, the original tap water without any polluted water can be supplied to the water supply pump 81b and the water supply device 6.

FIG. 4 is a diagram showing a second configuration example of the water supply control unit. In the water supply control unit 1B in the second configuration example, as the water supply state detecting means 11 described above,
A combination of the filter 11a and the two pressure sensors 11b and 11c is employed. That is, the filter 11a is arranged in series in the middle of the pipe 7, and the filter 1a
1a, a pressure sensor 11b is provided on the upstream side, and a pressure sensor 11c is provided on the downstream side, and the two pressure sensors 11b, 11c are provided.
Are input to the water supply control device 10, respectively. In the second configuration example, the pressure sensor 11b is replaced by a pressure sensor 75 provided in the primary piping system. In this case, the pressure sensor 11b (75) is connected to the water supply control device 10 of the water supply control unit 1B and also to the control device that controls the entire water supply device 8 described above. The strainer 73 may be used as the filter 11a, and pressure sensors may be provided upstream and downstream of the strainer 73.

Under this configuration, when the contaminated water is pumped in when the water supply is restored after the water supply is cut off, the mesh of the filter 11a is clogged with the foreign matter, and the difference (pressure loss) in the water supply pressure on both sides of the filter 11a. Occurs. Water supply control device 1
In the case of 0, the difference between the water supply pressures is obtained based on the detection signals of the two pressure sensors 11b and 11c. That is, it is determined that the water supply state is a mode related to the water cutoff (water cutoff mode). The control contents other than the determination of the contamination and the dust are described in step S2 in FIG.
Since the subsequent control contents are substantially the same, the description thereof will be omitted.

In the water supply control unit 1B, the contamination and dust after the interruption of the water supply are accurately discriminated, and when the contamination and the dust after the interruption of the water supply are discriminated, all the contaminated water immediately after the return of the water supply is discharged from the drain pipe 12. So, even after water cut off,
The original tap water without any polluted water is supplied by the water supply pump 81b.
And the water supply device 6.

FIG. 5 is a diagram showing a third configuration example of the water supply control unit. In the water supply control unit 1C according to the third configuration example, the water supply state detection means 11 employs a pollution degree detection sensor 112. The contamination detection sensor 112 includes, for example, a light-emitting element and a light-receiving element arranged at positions corresponding to a distance in the radial direction of the pipe 7, and of the light emitted from the light-emitting element, the light-receiving element is transmitted through water in the pipe 7. The ratio of the amount of light received is obtained in step (1), and an electric signal indicating the ratio of the amount of light is transmitted to the water supply control device 10. Water supply control device 1
0 monitors the signal from the pollution degree detection sensor 112, and when the signal level becomes lower than a predetermined level due to the contamination of the water in the pipe 7, it is determined that the water is polluted water after water cutoff. That is,
It is determined that the water supply state is in a mode related to water cutoff (water cutoff mode). Other control contents other than this polluted water determination are as follows:
Since the contents of the control after step S2 in FIG. 3 are substantially the same, the description thereof will be omitted.

In the water supply control unit 1C, the polluted water after water cutoff is accurately determined by using the pollution degree detection sensor 112, and when it is determined that the water is the polluted water, all the polluted water immediately after the return of the water supply is drained from the drain pipe 12C. Therefore, even after the water supply is cut off, the original tap water without any polluted water can be supplied to the water supply pump 81b and the water supply device 6.

FIG. 6 is a diagram showing a fourth configuration example of the water supply control unit. In the water supply control unit 1D according to the fourth configuration example, a water leakage sensor 113 is employed as the water supply state detection means 11 described above.

The water leakage sensor 113 is provided independently on the check valve (check valve) 74 or below the check valve 74. First, the structure of the check valve 74 will be described.
Is composed of three chambers, a primary side opening, an intermediate chamber, and a secondary side opening, a conduction chamber is formed above the intermediate chamber and communicates with the primary side opening using a diaphragm as a partition, and a lower part of the intermediate chamber is formed. A discharge port is formed which is opened and closed by a relief valve which moves up and down. The water leak sensor 113 is provided below the outlet, and detects water flowing from the outlet.

In the check valve having the above structure, the water supply pressure on the primary side is high during normal water supply, so that water flows through the primary side opening and the secondary side opening in the order of the valves. Further, since the water pressure in the conduction chamber is the same as the high water supply pressure on the primary side, the diaphragm is pressed downward, and the relief valve is urged downward to close the discharge port. On the other hand, when the water is cut off, the water pressure on the primary side is reduced, so that the downward pressure of the diaphragm is reduced, and as a result, the relief valve is urged upward to open the discharge port. Therefore, the water in the intermediate chamber is discharged from the discharge port as a leak, and the leak sensor 113 detects the leak and outputs a detection signal to the water supply control device 10.

The water supply control device 10 determines whether or not a signal has been sent from the water leak sensor 113. When the signal has been sent, it is determined that the water supply has been interrupted. The other control contents other than the water cut-off determination are substantially the same as the control contents in FIG.

In this water supply control unit 1D, the water cut is accurately determined using the check valve 74 or a water leak sensor 113 provided independently below the check valve 74. Since all the contaminated water immediately after the return of the water supply is discharged from the drain pipe 12, the original tap water containing no contaminated water can be supplied to the water supply pump 81b and the water supply device 6 even after the water supply is stopped.

FIG. 7 is a diagram showing a fifth configuration example of the water supply control unit. In the water supply control unit 1E according to the fifth configuration example, in addition to the above-described first configuration example, that is, a configuration in which the pressure sensor 111 (75) is employed in the water supply state detection unit 11, a pollution degree detection sensor is provided in the drain pipe 12. 15 are provided.

The pollution degree detection sensor 15 has the same configuration as the pollution degree detection sensor 112 used in the above-described third configuration example, and has a light emitting element disposed at a position corresponding to a distance in the radial direction of the drain tube 12. And a light receiving element, and among the light emission of the light emitting element, a ratio of the amount of light received by the light receiving element via the water in the drain pipe 12 is obtained, and an electric signal indicating the ratio of the amount of light is transmitted to the water supply control device 10. It is.

FIG. 8 is a flowchart showing a control procedure in the fifth configuration example of the water supply control unit. As shown in this flowchart, the control content executed by the water supply control device 10 is substantially the same as the control content (FIG. 3) in the first configuration example, and the only difference is in step S15. That is, in the case of the first configuration example, it is considered that the discharge of the polluted water has been completed when the predetermined time T2 has elapsed since the flow switch 14 was turned on. As shown in S15, the signal from the pollution degree detection sensor 15 is monitored, and when the signal level becomes higher than a predetermined level due to the elimination of the water pollution of the drain pipe 12, it is determined that the discharge of the polluted water is completed. Other control contents (steps S11 to S14 and steps S16 to S18) other than the determination of the completion of the discharge of the polluted water are the same as the control contents in FIG. 3 described above.

In the water supply control unit 1E, similarly to the water supply control units 1A to 1D described above, the water supply control unit 1E has the effect of preventing the supply of the polluted water to the supply destination after the interruption of the water supply, and directly controls the pollution degree of the discharged water. Monitoring,
For example, even when polluted water is sent over a long period of time, it is possible to properly discharge the water from the drain pipe 12 and to more reliably prevent the polluted water from being sent to the water supply destination. Can be.

In the above description, the flow switch 14 is disposed on the drain pipe 12. However, the flow switch 14 may be provided at an arbitrary position on the primary side of the pipe 7 instead of the drain pipe 12.

Further, the water supply immediately after the water supply is restored after the water supply is stopped is detected by the flow switch 14, but instead of the flow switch 14, other means such as the pressure sensor 111 (7) is used.
It may be configured to detect using 5).

Further, in the water supply control unit 1E, the pollution degree detection sensor 15 is disposed on the drain pipe 12, but the pollution degree detection sensor 15 is provided not at the drain pipe 12, but at an arbitrary position on the primary side of the pipe 7. It may be.

Further, in the water supply control unit 1E, the first
Although the turbidity detection sensor 15 is provided for the configuration example described above, the turbidity detection sensor 15 may be provided for the second, third, and fourth configuration examples. In that case, in the third configuration example, the two pollution degree detection sensors 11
2 and 15 are used, but only one pollution degree detection sensor 112 provided in the pipe 7 is used, and the contamination degree detection sensor 112 performs both the detection of water cutoff and the detection of pollution water elimination. It can also be configured.

In the above description, the electrically operated on-off valve 13 is used for the drain pipe 12. However, instead of the electrically operated on-off valve 13, another electrically controllable on-off valve, for example, an electromagnetic valve is used. May be.

Although the water supply device 8 is provided in the secondary piping system, water may be directly supplied to the water supply equipment of each household without providing the water supply device 8. Alternatively, water may be supplied to a water supply device of each household via a water receiving tank.

Further, although the control of the water supply control unit 1 is performed by the water supply control device 10, the control may be performed collectively by a control device that controls the water supply device 8. In this case, the control device that controls the water supply device 8 includes a water supply state detection unit 11, an electric on-off valve 13,
What is necessary is just to connect the flow switch 14.

Further, as the water supply state detecting means 11, a pH sensor for detecting the pH of the water in the pipe 7 on the primary side may be used. In this case, when the detection level of the pH sensor is out of the predetermined range, it is determined that the pH of the water has changed due to the contamination due to the water cutoff, and the water cutoff mode is determined.

Further, a chlorine concentration sensor for detecting the chlorine concentration of water in the primary pipe 7 may be used as the water supply state detecting means 11. In this case, when the detection level of the chlorine concentration sensor is out of the predetermined range, it is determined that the chlorine concentration has changed due to the pollution caused by the water cutoff, and the water cutoff mode is determined.

Further, in the above description, the drainage pipe 12 is provided with the turbidity detection sensor 15, but instead of the turbidity detection sensor 15, a pH detection sensor and a chlorine concentration sensor are provided. Is also good. In this configuration, when the detection levels of the pH and the chlorine concentration of the discharged water are out of the predetermined ranges, it is determined that the discharged water is still polluted, and the discharge is continued.

[0060]

Since the present invention has the above-described configuration,
The following effects can be obtained.

According to the first aspect of the present invention, when the water cutoff is detected, the contaminated water flowing at the time of the return of the water supply after that is completely discharged from the drain pipe, and then returned to the normal water supply state. It can be prevented from being sent to households, water supply pumps, water receiving tanks, etc., and therefore safe and clean water can always be supplied. In addition, there is no need for extra maintenance work on the water supply pump and water receiving tank, which was previously required for discharging polluted water and contaminating contaminated water.This eliminates much waste including cost. it can.

Further, the invention according to claim 5 has an effect of preventing the supply of polluted water to the supply destination after the water cutoff, and directly monitors the pollutant level of the discharged water. Even when water is sent, it is possible to continue discharging the water from the drain pipe appropriately, and it is possible to more reliably prevent the polluted water from being sent to the water supply destination.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a water supply control unit of the present invention and an entire configuration of a water supply system to which the water supply control unit is applied.

FIG. 2 is a diagram showing a first configuration example of a water supply control unit.

FIG. 3 is a flowchart illustrating a control procedure in a first configuration example of the water supply control unit.

FIG. 4 is a diagram showing a second configuration example of the water supply control unit.

FIG. 5 is a diagram showing a third configuration example of the water supply control unit.

FIG. 6 is a diagram illustrating a fourth configuration example of the water supply control unit.

FIG. 7 is a diagram illustrating a fifth configuration example of the water supply control unit.

FIG. 8 is a flowchart illustrating a control procedure in a fifth configuration example of the water supply control unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water supply control unit 1A Water supply control unit 1B Water supply control unit 1C Water supply control unit 1D Water supply control unit 1E Water supply control unit 5 Water distribution small pipe 6 Water supply equipment 7 Pipe 8 Water supply device 10 Water supply control device 11 Water supply state detecting means 11a Filter 11b Pressure sensor 11 Pressure sensor 12 Drain pipe 13 Electric open / close valve 14 Flow switch 15 Pollution degree detection sensor 71 Meter 72 Gate valve 73 Strainer 74 Check valve 75 Pressure sensor 81 Pipe 81b Water supply pump 82 Pipe 82a Check valve 83 Pipe 83b Water pump 84 Downstream side Connection part 85 Pressure tank 86 Pressure sensor 111 Pressure sensor 112 Pollution degree detection sensor 113 Water leakage sensor

Claims (9)

[Claims] 1. A water supply control unit for controlling water supply in a water supply destination upstream pipe located upstream of a water supply destination, comprising: a water supply state detecting means provided in the water supply destination upstream pipe; and the water supply destination upstream pipe. A normally open closed valve provided on the drain pipe, and whether or not the water supply state is a water cutoff mode related to water cutoff based on a detection signal detected by the water supply state detection means. A water supply control device that opens the on-off valve when it is determined that the water supply is in a water-off state, drains the water after the return of water supply from the drain pipe for a predetermined time, and then returns the on-off valve to a closed state. A water supply control unit characterized by the following. 2. The water supply state detection means is a pressure sensor for detecting a water supply pressure, and the water supply control device determines that the water supply is cut off when the water supply pressure detected by the pressure sensor falls below a predetermined pressure. Item 2. A water supply control unit according to item 1. 3. The water supply state detecting means includes: a filter;
The water supply control device comprises two pressure sensors disposed on the upstream side and the downstream side of the filter for detecting a water supply pressure, wherein the water supply control device detects when a difference between the water supply pressures detected by the two pressure sensors is equal to or greater than a predetermined differential pressure. The water supply control unit according to claim 1, wherein the water supply control unit determines that the water supply is in a water cut mode. 4. The water supply state detection means is a contamination degree detection sensor for detecting the degree of contamination of the water supply, and the water supply control device is configured such that the degree of contamination of the water supply detected by the contamination degree detection sensor is equal to or higher than a predetermined degree of contamination. The water supply control unit according to claim 1, wherein the water supply control unit determines that the water supply is in a water-off state. 5. A water supply control unit for controlling water supply in a water supply destination upstream pipe located upstream of a water supply destination, comprising: a water supply state detection means provided in the water supply destination upstream pipe; and the water supply destination upstream pipe. A drain pipe connected to the drain pipe, a normally-closed on-off valve provided on the drain pipe, a second pollution degree detection sensor provided on the drain pipe for detecting the degree of contamination of water supply, and the water supply state detection means It is determined whether or not the water supply state is a water cutoff mode related to the water cutoff based on the detection signal detected.When the water supply cutoff state is determined, the open / close valve is opened, and the second pollution degree detection sensor A water supply control device that returns the on-off valve to a closed state when the detected water pollution degree of the water discharged from the drain pipe after the return of the water supply becomes equal to or less than a second predetermined pollution degree. Controller unit. 6. A water amount detecting means for detecting an amount of water in the drain pipe, wherein the water supply control device, when the amount of water detected by the amount of water detecting means is equal to or more than a predetermined amount of water, the water is supplied after the return of the water supply. The water supply control unit according to claim 1, wherein the water supply control unit determines that: 7. The water supply system according to claim 1, wherein at least a check valve is arranged between the water supply destination upstream pipe and the water supply destination, so that water flows only toward the water supply destination. A water supply control unit according to item 1. 8. The water supply control unit according to claim 7, wherein a water supply pump for supplying water to a water supply destination is disposed further downstream of the check valve. 9. The water supply control unit according to claim 8, wherein the water supply control device is provided in a control device that controls the water supply pump.