JPH08210290A - Water supply system - Google Patents

Abstract

PURPOSE: To perform water supply and to prevent it from occurring that a water supply system is rendered impossible to pump up by a method wherein when it is possible for water of a feed water source to be used even when a delivery pressure is lowered, the feed of water is effected through automatic reset without the need for a user to go to a site. CONSTITUTION: In a water supply system formed in such a manner that a pressure detecting means is arranged on the delivery side of a pump and a protection circuit X is provided to protect a pump by stopping the pump when a delivery pressure is lowered, a timer circuit T3 for confirming a power source is arranged and when a starting condition is established after turning ON of a power source, the pump is started. A circuit I is provided to bring a pressure lowering protection circuit X into an ineffective state until clocking of a time long enough to increase a pressure in a feed water pipe on the delivery side of a pump to a value higher than the return pressure of the delivery pressure reduction protecting circuit X is completed. Since a timer to clock a time long enough to exceeds the detecting level of a pressure detecting sensor after restoration of service interruption is provided, this constitution prevents it from occurring that the feed water supply system is impossible to operate resulting from lowering of a delivery pressure, resulting in prevention of the occurrence of suspension of water supply.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply apparatus suitable for continuing automatic operation even when a water supply company restricts water supply or when a power failure is restored, especially in summer.

[0002]

2. Description of the Related Art There are two conventional water supply systems: a water tank system and a water supply system directly connected to a water pipe. These methods will be described with reference to FIGS. 6 to 10.

FIG. 6 is a system diagram of a water supply system of a water receiving tank system. 1 is a water main, 2 is a water main branch, and 3 is tap water from the water main branch into a water receiving tank 5. For controlling the water level (ball tap), 4 is a water level detecting means for detecting the water level in the water receiving tank, 6 is a sluice valve 7 in the middle, and a suction pipe for connecting the water supply pump 8 to the water receiving tank 5, 9 is Check valve,
Reference numeral 10 is a sluice valve, 11 is a pressure tank having an air reservoir inside, and 13 is a water supply pipe connecting the discharge side of the water supply pump 8 and the demand side water supply devices 14a to 14d.

PS2 is, for example, a pressure detecting means which is closed below the lower limit pressure P1 shown in FIG. 7 and which opens above the upper limit pressure P2, and is provided near the pressure tank 11 described above. Similarly, PS1 is a pressure detecting means for detecting a discharge pressure drop state and detecting a state of being unable to pump water due to the suction side air pool of the water supply pump 8, and is provided on the upstream side of the check valve 9 as shown in FIG. Close below the indicated pressure PL, P
It is set to return at L '.

FIG. 8 shows a control unit of the system diagram of the water supply system shown in FIG. 6, where A is the operating circuit section of the pump and PS
2a (contact of the pressure switch PS2 described above), 52 (operation switch of pump), 49 (contact of overload protection relay of pump), output contact 63X1 of discharge pressure drop detection circuit X
b, the output contact 33WXb of the water level detection circuit Y.
Circuit X is switch SS1, contact P of pressure switch PS1
S1a, timer T1, relay 63X1, display lamp O
1 is a discharge pressure detection circuit. That is, the switch SS1 is closed, and when the discharge pressure decreases to PL or less shown in FIG. 8 due to the influence of suction side air accumulation during pump operation, the contact PS1a of the pressure switch PS1 is closed and the timer T1 is energized. After this urging, when the timer T1 finishes measuring the time, the contact T1a is closed, the relay 63X1 is excited, the contact 63X1a self-holds, and the lamp O1 which means a discharge pressure drop is turned on. Y is a receiving tank water level detection circuit composed of a liquid level relay 33W, a relay 33WX and a water reduction indicator lamp O2.
Is to close the contact 33WC to the a side when the water level detecting means 4 shown in FIG. 7 drops below the stop water level, and to switch from the a side to the b side when the water level above the return water level is reached and close to the a side. Relay 33WX is excited, its contact 33WXa
Is closed and the water reduction lamp O2 is turned on.

By the way, the pump is usually a pressure switch PS
It operates when 2 is closed and stops when it is opened, but the discharge pressure drops as protection of the pump, and the relay 63X1 described above
When the contact 63X1b of the relay 33WXb is opened or the water level of the water receiving tank 5 is activated to open the contact 33WXb of the relay 33WX, the above-mentioned operation circuit A is opened and the pump is stopped.

Since such a protective device is provided, the pump is stopped when the water level in the water receiving tank becomes lower than the water level below the water level due to a power outage (including water outage during construction) or water shortage. However, while there is water in the pressure tank 11 and the water supply pipe 13, water is consumed by the consumer, and eventually, even if the water faucet at the end is opened, the water is consumed until it disappears. In such a state, even if the power is restored or the water shortage is resolved, the discharge pressure drop detection circuit X operates and the water is cut off. That is, the pump is operated when the water level in the water receiving tank reaches the return water level or higher, but since the pressure tank 11 and the water supply pipe 13 are empty, the pump is supplied with water within the time measured by the timer T1 (FIG. 8). Filling the water supply pressure with the return pressure P shown in FIG.
This is because the relay 63X1 of the circuit X is energized and the pump is stopped because it cannot be raised to L'or more. As a countermeasure against power recovery, it may be possible to lengthen the time measured by the timer T1, but if this time is lengthened, it will not serve as a protection during normal use.

FIG. 9 is a block diagram showing an example of a water supply system directly connected to a water supply. 1 is a water main pipe, 2 is a water distribution pipe, 6 and 10 are gate valves, and 8 is a pump, which is driven by an inverter in this example. . 9 is a check valve, 11 is a pressure tank, 13 is a water pipe,
PS3 is a pressure sensor provided in the pump suction side water pipe, and is set as shown in FIG. That is, when the water distribution pipe pressure becomes equal to or lower than L3, the pump is stopped, the pump rises above this water level, and a stop signal is issued to restart the operation after a certain time (for example, 5 to 10 seconds) has elapsed. PS2 is the same as the pressure switch described with reference to FIG.

FIG. 11 shows a control device for operating the water supply system of FIG. ELB is an earth leakage circuit breaker, INV is an inverter for controlling the rotation speed of the pump according to the load variation, and supplying water while keeping the pressure on the discharge side at a constant pressure, and an operation signal 52a from outside and a predetermined value. The operation speed command N is given. Since X is the same as the discharge pressure detection circuit X shown in FIG. 8, its explanation is omitted.
Z is a suction side pressure detection circuit including a switch SS2, a contact PS3a of a pressure switch PS3 for detecting the suction side pressure, a timer T2, a relay 63X2, and a lamp O3 for displaying a suction side pressure drop. PS
3 drops below L3 shown in FIG. 10, and when the timer T2 finishes measuring time, its contact T2a closes and the relay 63X
2 urges. B is an alarm circuit for issuing an alarm by the buzzer BZ when the discharge pressure decreases and the suction side pressure decreases. A is an operating circuit similar to that of FIG. 8, and the water level detection circuit output contact 33W
Output contact 63X of suction side pressure detection circuit Z instead of Xb
2b, and these protection circuits work when the discharge pressure drops or the suction side pressure (which occurs when the water supply company lowers the main water pressure and supplies water due to work interruption or lack of water) Pump stops. In this case as well, the water supply company limits water supply in the same way as in the previous example, but circuit A opens and the pump stops due to construction interruption or blackout, but even if these conditions are released, tank 11 and water supply pipe 1
Since water will be consumed while there is water in 3, the discharge pressure will drop as in the previous example, and water supply will not be possible.

[0010]

The above-mentioned conventional techniques have the following problems. That is, especially when the water supply is short, such as in the summer, the water supply company limits the water supply, or when the water supply from the water supply source is cut off at the time of construction water interruption or power outage,
Since the consumer consumes the water accumulated in the pressure tank and the water supply pipe, even if these conditions are released and the water supply source can be used, the discharge pressure will decrease and the water supply will not be possible. .

Further, once the discharge pressure is lowered, since the self-holding (memorizing) is performed as described above, the maintenance (maintenance and inspection) company goes to the site and resets (turns off the power and turns on again). ), The operation of the discharge pressure drop detection circuit X is released, and the switch SS1 must be opened to operate until the discharge side water pressure is restored to PL or higher shown in FIG.

Therefore, according to the present invention, even if the discharge pressure is reduced, it is possible to automatically reset the water supply without going to the site when the water of the water supply source becomes available, and to eliminate the inability to pump water. To aim.

[0013]

To achieve the above object, a feature of the present invention is that a pressure detecting means is provided on the pump discharge side, and the pump is stopped when the discharge pressure decreases. In a water supply system with a protection circuit for protection, a timer circuit for power supply confirmation is provided, and the pump is started when the start condition is established after the power is turned on, and the pressure in the pump discharge side water supply pipe is the discharge pressure drop protection circuit. The discharge pressure drop protection circuit is invalidated until the time sufficient to rise above the return pressure of 1 is finished.

Further, according to the present invention, in a water receiving apparatus of a water receiving tank system, a water level detecting means and a protection circuit for stopping and protecting the pump when the discharge pressure is lowered are provided in the water receiving tank.
After the water in the water supply pipe is consumed due to the water supply restriction, the discharge pressure is lowered and the protection circuit operates and the water is cut off, the water supply restriction is released, and when the water receiving tank water level detection means detects the return water level, the discharge is performed. Reset the pressure drop protection recovery,
The feature is that the pump can be operated.

Further, the present invention, in a water supply device directly connected to a water pipe, has a pressure detecting means for detecting the pressure on the suction side of the pump and a protective function for stopping the pump when the pressure falls below a specified value. It has a pressure detecting means to detect the pressure on the pump discharge side and a protective function to stop the pump when this falls below a specified value.The water in the water supply pipe is consumed due to the water supply restriction, and the discharge pressure drops and protects. After the circuit operates and the water is cut off, the water supply restriction is released, and when the suction side pressure detection means detects the recovery pressure of the suction side pressure, the discharge pressure drop protection circuit is reset and the pump can be operated. It is characterized by

[0016]

With the above construction, a timer is provided for measuring a time sufficient to exceed the detection level of the discharge pressure detection sensor after a power failure is restored, so that the discharge pressure decreases and the operation becomes impossible. Therefore, there is no water cut.

Further, since the operation of the discharge pressure detection circuit is reset based on the pressure recovery signal on the suction side of the pump or the water level recovery signal of the water receiving tank, the power supply confirmation relay operates temporarily. It can be reset even after the discharge pressure has decreased, so pumping is not possible.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the control circuit shown in FIG. This figure is obtained by adding a power supply confirmation circuit section I to FIG. 8 described in the prior art. Therefore, description of the same parts as those in FIG. 8 will be omitted. In the figure, T3 is a timer for confirming the power supply, which is set to about 10 minutes. T3a is the time limit contact of the timer,
A contact that closes about 10 minutes after energizing, 27X is a relay,
When the time limit contact T3a of the timer T3 is closed, it is energized, it is self-held by its own contact 27Xa, and the timer T3 is reset by the contact 27Xb. Further, the contact 27Xa is connected as an input condition of the timer T1 of the discharge pressure detection circuit X.

For example, when there is sufficient water in the water receiving tank, the low water level is not operating (33WXb is closed), and the power failure is canceled (including the power failure during construction), the timer T3 is activated. Has set the time to about 10 minutes, the contact T3a of itself is not closed yet. Therefore, the output contact 63X1b of the discharge pressure detection circuit X is not closed. When the consumer uses water in this state, the pressure detecting means PS2 is closed and the pump is operated to supply water to the pressure tank and the water supply pipe 13. Since the timer T3 is sufficiently long as about 10 minutes, the pressures of the pressure tank and the water supply pipe are sufficiently increased before the timing of the timer T3 is finished, and the pump discharge pressure is the discharge pressure detecting means P.
It rises above the return pressure PL 'of S1 (FIG. 7). Therefore, after the expiration of T3, when the contact point T3a of itself is closed, the contact point of the discharge pressure detection means PS1 is open, and the discharge pressure detection circuit X does not operate.

Although this embodiment has been described with reference to the example of the water receiving tank system shown in FIG. 8, the same applies to the direct connection system shown in FIGS. 9 and 11.

The second embodiment (water receiving tank system) will be described with reference to FIG. In the figure, the reset circuit of the C part is provided in FIG. 8, and the timer T4 is connected to the contact b side (return side) of the liquid level relay 33W to eliminate the water shortage, and the water level of the receiving tank is E1.
When the water level becomes equal to or higher than the water level (for example, detected by an electrode rod or the like), the contact 33WC of itself closes from the side a to the side b, and the timer T4 is energized. Then, the contact T4a closes after 30 seconds (returns after a certain time), and the reset relay RS
Excite X. That is, by the contact RSXb of the reset relay RSX, the relay 63X1 of the discharge pressure detection circuit X is
Since the self-holding of the pump is released, the pump can be operated.

The third embodiment (direct connection system) will be described with reference to FIG. In FIG. 11, a reset circuit for the D section is provided in FIG. 11 as in the second embodiment, and the suction side pressure is, for example, the pressure level L3-L3 shown in FIG. 10 by the pressure detecting means PS3 provided on the suction side. Is detected for a certain period of time (for example, 30
After that, based on this signal, the self-holding (including storage) of the discharge pressure detection circuit X is released. That is, in FIG.
When the suction side pressure detection means PS3 detects the suction side pressure L3-L3 or more, the contact PS3C is closed from the side a to the side b. At this time, the timer T5 is energized, and when the set time, for example, 30 seconds has elapsed (D portion), the contact T5b opens,
The self-holding circuit of the relay 63X1 is released, and the pump is returned to the operable state (X section).

As a fourth embodiment, an example of a water receiving tank system at the time of both power failure and water shortage countermeasures will be described with reference to FIG. This embodiment is provided with the I portion described in the first embodiment and the circuit C portion described in the second embodiment. That is, as described above, after the power failure is restored, the discharge pressure is not detected by the circuit I section for about 10 minutes, and the discharge pressure is restored to the specified value or higher by the operation of the pump. Further, after the water shortage is resolved, the operating discharge pressure reduction state is reset by the circuit C section.

As a fifth embodiment, an example of the direct connection system at the time of both the power failure and the water shortage will be described with reference to FIG. The present embodiment is provided with the D portion described in the third embodiment and the I portion described in the fourth embodiment. The operation after the recovery from the power failure is the same as that described above, so the description thereof will be omitted. However, after the water shortage is resolved, the discharged discharge pressure drop state is reset based on the circuit section D, that is, the suction side pressure recovery signal. .

According to the above-described embodiment, since the timer for timing the time sufficient to exceed the detection level of the discharge pressure detection sensor is provided after the recovery from the power failure, the discharge pressure does not decrease. Further, after the discharge pressure is reduced, the reset is performed based on the recovery of the pressure on the suction side of the pump or the recovery of the water level in the water receiving tank. Therefore, it is possible to avoid the water cutoff due to the decrease of the discharge pressure.

Although the above embodiment uses the relay circuit, the pressure detecting means and the water level detecting means may be electronic, and an electronic circuit or a microcomputer is used for the control circuit to implement these functions by software. Obviously, it may be realized by wear.

[0027]

As is apparent from the above description, according to the present invention, after the power failure is restored, the timer for timing the time sufficient to exceed the detection level of the discharge pressure detection sensor is provided. Will not drop and will not be inoperable,
Therefore, it will not be cut off.

Further, since the operation of the discharge pressure detecting circuit is reset based on the pressure recovery signal on the suction side of the pump or the water level recovery signal of the water receiving tank, the power supply confirmation relay is operated temporarily. Even after the discharge pressure drop has worked
Since this can be reset, pumping will not be impossible.

[Brief description of drawings]

FIG. 1 is a control circuit diagram showing an embodiment of the present invention.

FIG. 2 is a control circuit diagram showing another embodiment in which the present invention is applied to a water receiving tank system.

FIG. 3 is a control circuit diagram showing still another embodiment in which the present invention is applied to a direct connection system.

FIG. 4 is a control circuit diagram showing still another embodiment of the present invention.

FIG. 5 is a control circuit diagram showing still another embodiment of the present invention.

FIG. 6 is a system diagram of a water tank water supply system.

FIG. 7 is a pump operation characteristic diagram.

8 is a control circuit diagram of the water supply system system diagram shown in FIG.

FIG. 9 is a configuration diagram showing a water supply system directly connected to a water supply.

FIG. 10 is an explanatory diagram showing a setting state of the pressure sensor.

11 is a control circuit diagram for operating the water supply system of FIG. 9. FIG.

[Explanation of symbols]

4: Water level detecting means, 5: Water receiving tank, 8: Pump, PS1,
PS2, PS3: Pressure detecting means, A: Pump operating circuit section, I: Power supply confirmation timer circuit, BZ: Buzzer, X:
Discharge pressure drop detection circuit, Z: Water tank water level detection circuit

Claims (5)

[Claims] 1. A water supply device provided with a pressure detecting means on the discharge side of a pump, and a protection circuit for stopping and protecting the pump when the discharge pressure is reduced, provided with a timer circuit for power supply confirmation, After the power supply is turned on, when the start condition is established, the pump is started, and the discharge is continued until the pressure in the pump discharge side water supply pipe rises above the return pressure of the discharge pressure drop protection circuit until the timing is completed. A water supply device characterized in that the pressure drop protection circuit is disabled. 2. A water receiving apparatus of a water receiving tank system, wherein a water level detecting means and a protection circuit for stopping and protecting a pump when the discharge pressure is lowered are provided in the water receiving tank, and the water supply pipe is restricted by water supply restriction. After the water is consumed and the discharge pressure decreases and the protection circuit operates and the water is cut off, the water supply restriction is released, and when the receiving tank water level detection means detects the return water level, the discharge pressure drop protection recovery is performed. A water supply device characterized by being reset so that the pump can be operated. 3. A pressure detecting means is provided on the discharge side of the pump, a protection circuit is provided for stopping and protecting the pump when the discharge pressure is reduced, a timer circuit for confirming the power supply is provided, and the starting condition after the power is turned on is set. Once established, the pump is started and the discharge pressure drop protection circuit is disabled until the pressure in the pump discharge side water supply pipe has timed enough to rise above the return pressure of the discharge pressure drop protection circuit. The water supply device according to claim 2, wherein 4. A water supply device directly connected to a water pipe,
It has a pressure detecting means for detecting the pressure on the suction side of the pump and a protective function for stopping the pump when it falls below a specified value, and a pressure detecting means for detecting the pressure on the discharge side of the pump and a pump when it falls below the specified value. Has a protective function of stopping the water supply, water in the water supply pipe is consumed due to the water supply restriction, the discharge pressure drops, and the protection circuit operates and the water is cut off, then the water supply restriction is released and the suction side pressure detection means When the recovery pressure of the suction side pressure is detected, the discharge pressure drop protection circuit is reset to enable the pump to operate. 5. A pressure detecting means is provided on the discharge side of the pump, a protection circuit is provided for stopping and protecting the pump when the discharge pressure is reduced, a timer circuit for power confirmation is provided, and the starting condition after the power is turned on is set. Once established, the pump is started and the discharge pressure drop protection circuit is disabled until the pressure in the pump discharge side water supply pipe has timed enough to rise above the return pressure of the discharge pressure drop protection circuit. The water supply device according to claim 4, wherein