JPH1137054A - Direct feed water device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a direct feed water device capable of taking various measures before the primary side pressure of a pump lowers and a pump is stopped with excellent operability. SOLUTION: In a direct feed water device where a pump 1 is directly coupled with a piping 9, and water is sucked from the primary side inlet of the pump 1 and discharged through the secondary side outlet to increase pressure in the secondary side piping for feeding water, the primary side pressure P of the pump detected by the pressure detecting means 3 for detecting the primary side pressure of the pump 1, is compared with a first set pressure P1 previously set through a comparator 5-1, and when the primary side pressure P of the pump is less than the first set pressure P1, an alarm signal is issued, and the primary side pressure P of the pump detected by the pressure detecting means 3 is compared with a second set pressure P2 which is lower than the first set pressure P1 by a prescribed value, through a comparator 5-2, and when the primary side pressure P of the pump decreases less than the second set pressure P2, the pump 1 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply system for directly connecting a pump to a water supply main pipe or the like to supply water to a demand place such as a building or an apartment.

[0002]

2. Description of the Related Art Conventionally, there is a direct water supply device in which a pump is directly connected in the middle of a pipe such as a water main pipe to increase the internal pressure of a secondary pipe of the pump to supply water to a demand place such as a building or an apartment. In such a direct water supply device, a device such as a pump for supplying water to another demand place is connected to a pipe on a primary side of the pump, and the primary device of the pump is required to operate these other devices normally. It is necessary to keep some pressure on the side. Also, when the pump is operated at a low primary side pressure, the performance of the directly connected water supply device itself may be significantly reduced. For this reason, in such a device, there is a device in which the pump is stopped when the primary pressure of the pump decreases.

[0003]

As described above, in a direct water supply system in which the pump is stopped when the primary pressure of the pump is reduced, the pump is stopped when the primary pressure of the pump is reduced. However, prior measures could not be taken, and for example, there was a problem that the life of residents was hindered.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and eliminates the above-mentioned problems. Various measures can be taken before the primary pressure of the pump drops and the pump is stopped. It is an object of providing a good direct connection water supply device.

[0005]

According to the first aspect of the present invention, a pump is directly connected to a pipe, water is sucked from a primary inlet of the pump, and discharged from a secondary outlet. In a direct water supply device that pressurizes and supplies water in the secondary pipe by performing pressure, pressure detection means for detecting the primary pressure value of the pump, and the primary pressure value of the pump detected by the pressure detection means are set in advance. Alarm means for comparing the first set pressure value with the first set pressure value and issuing an alarm signal when the primary pressure value of the pump becomes equal to or less than the first set pressure value; The value is compared with a preset second set pressure value lower than the first set pressure value by a predetermined amount, and when the primary pressure value of the pump falls below the second set pressure value, the pump is turned off. Characterized in that a pump stopping means for stopping is provided. That.

According to a second aspect of the present invention, in the direct water supply system according to the first aspect, the primary pressure value of the pump detected by the pressure detecting means is compared with a first set pressure value set in advance. When the primary pressure value of the pump becomes equal to or higher than the first set pressure value, the alarm signal is automatically stopped.

According to a third aspect of the present invention, in the direct water supply system according to the first or second aspect, the primary pressure value of the pump detected by the pressure detecting means and the second predetermined pressure value are set in advance. In comparison, the pump is restarted when the primary pressure value of the pump becomes equal to or more than the second set pressure value.

According to a fourth aspect of the present invention, in the direct water supply device of the first aspect, the primary pressure value of the pump detected by the pressure detecting means is compared with a first set pressure value set in advance. Even if the primary pressure value of the pump is equal to or higher than the first set pressure value, the alarm is continuously output until the reset switch is operated.

According to a fifth aspect of the present invention, in the direct water supply system according to the first aspect, the primary pressure value of the pump detected by the pressure detecting means is compared with a second preset pressure value. Even when the primary pressure value of the pump becomes equal to or higher than the second set pressure value, the pump is stopped until the reset switch is operated.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration example of a direct water supply device according to the present invention. As shown in the drawing, the water supply device is directly connected to the pump 1 in the middle of the pipe 9. That is, the pipe 9 is connected to the primary suction port and the secondary discharge port of the pump 1. In such a direct water supply system, the pump 1
The other pipes 6, 7, 8 such as a pump and a fire hydrant for supplying water to a house are connected to the primary pipe 9.

In order to normally operate other equipment connected to the piping 9 on the primary side of the pump 1 and to prevent the performance of the water supply device itself from being reduced, a certain degree is always provided on the primary side of the pump 1. Pressure must be maintained. For this purpose, it is necessary to stop the pump 1 by issuing an alarm when the pressure in the pipe 9 on the primary side of the pump 1 becomes lower than a predetermined set pressure value.

Pressure detecting means (pressure sensor) 3 for detecting the pressure in the pipe 9 on the primary side of the pump 1, ie, the pressure on the suction side.
Is provided. The output of the pressure detecting means 3 is a comparator 5
-1 and one input terminal of the comparator 5-2. The output of the first pressure setting means 4-1 is connected to the other input terminal of the comparator 5-1 and the second pressure setting means 4-2 is connected to the other input terminal of the comparator 5-2. Output is connected. The outputs of the comparator 5-1 and the comparator 5-2 are connected to the control panel 2. A motor M for driving the pump 1 is connected to the control panel 2.

In the direct water supply apparatus having the above-described structure, the comparator 5-1 includes the primary pressure value P detected by the pressure detecting means 3 and the set pressure value P1 set by the first pressure setting means 4-1. If the primary pressure value P detected by the pressure detecting means 3 is lower than the set pressure value P1, an alarm signal is transmitted to the control panel 2. When the control panel 2 receives this alarm signal, it issues an alarm with a buzzer, an external contact output, telemeter communication, or the like, and notifies the pump manager of the abnormality. When notified of this abnormality, the pump manager takes measures such as restricting the water supply by squeezing a discharge valve (not shown) in order to reduce the discharge pressure of the pump 1 so as to avoid stopping the pump 1.

The comparator 5-1 comprises a primary pressure value P of the pump 1 detected by the pressure detecting means 3 and a first pressure setting means 4-1.
Then, if the primary pressure value P is higher than the set pressure value P1, an alarm cancel signal for canceling the alarm signal is transmitted to the control panel 2. When the control panel 2 receives this alarm release signal, the buzzer, external contact output,
Stop the alarm issued by telemeter communication or the like.

[0015] In the direct water supply apparatus as described above, once the primary pressure value P of the pump 1 drops, the pump manager keeps alarming and cancels the alarm when the primary pressure of the pump 1 recovers. The operation was difficult.
In particular, when the water supply is cut off in the whole area and the primary pressure of the pump 1 drops, the alarm canceling operation must be performed on the pumps 1 of all the directly connected water supply devices in the area. As described above, when the primary side pressure value P becomes higher than the set pressure value P1, an alarm canceling signal is transmitted to the control panel 2 and the alarm is stopped, thereby releasing the troublesome alarm canceling operation. .

The comparator 5-2 comprises a primary pressure value P of the pump 1 detected by the pressure detecting means 3 and a second pressure setting means 4-2.
Then, if the primary pressure value P is lower than the set pressure value P2, a pump stop signal for stopping the pump 1 is transmitted to the control panel 2. When receiving the pump stop signal, the control panel 2 stops the motor M and stops the pump 1. The comparator 5-2 releases the pump stop when the primary pressure value P detected by the pressure detecting means 3 becomes higher than the set pressure value P2 set by the second pressure setting means 4-2. A release signal is transmitted to the control panel 2. When receiving the pump stop release signal, the control panel 2 restarts the motor M and restarts the pump 1. Here, the set pressure value P2 of the second pressure setting means 4-2 is lower by a predetermined amount than the set pressure value P1 of the first pressure setting means 4-1 (P
2 <P1) is set.

As described above, the pump manager once sets the pump 1
If the primary side pressure value P decreases, the alarm remains on and the operation of releasing the alarm is difficult, and at the same time, the operation of restarting and restarting the pump 1 is also difficult. In particular, there is a disadvantage that when the primary pressure of the pump 1 is reduced due to the water cutoff operation in the entire area, the troublesome work of restarting and restarting the pump must be performed for all the pumps 1 in the area. . As described above, when the primary side pressure value P becomes higher than the set pressure value P2, the comparator 5-2 transmits a pump stop release signal to the control panel 2, restarts the motor M, and restarts the pump 1. Thus, the trouble of the pump 1 stopping can be minimized at the same time as being free from such a troublesome work of the pump returning / restarting operation.

The comparator 5-1 compares the primary pressure value P detected by the pressure detecting means 3 with the set pressure value P1 set by the first pressure setting means 4-1. When the primary pressure value P is higher than the set pressure value P1, an alarm cancel signal for canceling the alarm is transmitted to the control panel 2. The control panel 2 does not stop the alarm issued by the buzzer, the external contact output or the like until the reset button (not shown) provided on the control panel 2 is pressed even if the alarm cancel signal is received, that is, the alarm To maintain.

When the primary side pressure value P becomes higher than the set pressure value P1 and the control panel 2 receives the alarm canceling signal, the alarm is automatically cancelled.
And the primary side pressure drop and recovery are repeated, and the above-mentioned alarm release phenomenon is repeated. In this case, the control panel 2 does not release (stop) the alarm until the reset button is pressed, even if the control panel 2 receives the alarm release signal, as described above, so that the administrator can control the primary pressure of the pump 1. It will always be possible to confirm that there has been a drop.

The comparator 5-2 compares the primary pressure value P detected by the pressure detecting means 3 with the set pressure value P2 set by the second pressure setting means 4-2. When the value P is lower than the set pressure value P2, a pump stop signal for stopping the pump 1 is transmitted to the control panel 2. When receiving the pump stop signal, the control panel 2 stops the motor M and stops the pump 1. The comparator 5-2 has a primary side pressure value P
Is higher than the set pressure value P2, a pump stop release signal for releasing the pump stop is transmitted to the control panel 2. The control panel 2 does not restart the pump 1 until the reset button provided on the control panel 2 is pressed even if the pump stop release signal is received.

The primary pressure value P becomes lower than the set pressure value P2, the control panel 2 receives the pump stop signal and stops the pump 1, and subsequently the primary pressure value P becomes higher than the set pressure value P2, When the control panel 2 receives the pump stop release signal and restarts the pump 1, the stop / restart of the pump 1 is repeated every time the primary pressure reduction of the pump 1 is repeated without recovery by the administrator. Come out.
In this case, as described above, since the control panel 2 does not restart the pump 1 until the reset button is pressed even if the pump stop release signal is received, it is determined by the pump manager that the primary pressure of the pump 1 has dropped. Can always be confirmed.

[0022]

As described above, according to the invention described in each claim of the present application, an alarm means for issuing an alarm signal when the primary pressure value of the pump becomes equal to or less than the first set pressure value; When the primary pressure value falls below the second set pressure value,
Since the pump stopping means for stopping the pump is provided, only the alarm is issued at a pressure higher than the primary pressure for stopping the pump by a predetermined amount (slight amount), and it is known that the primary pressure of the pump is reduced before the pump stops. Pumps can be avoided by prior measures, and if measures are not taken, the pump will be stopped if the primary pressure of the pump further drops, causing inconvenience at the place of demand, etc. It can be expected that there is no excellent effect.

According to the second aspect of the invention, the primary pressure value of the pump is compared with a first preset pressure value, and the primary pressure value of the pump is set to the first set value. Since the alarm signal is automatically stopped when the pressure value becomes equal to or higher than the pressure value, the troublesome work of the pump manager performing the alarm release operation is released, and an excellent effect that the pump manager does not need to be dispatched unnecessary can be expected. .

According to the third aspect of the present invention, the pump is restarted when the primary pressure value of the pump becomes equal to or higher than the second set pressure value, so that the pump manager performs a pump restart operation. An excellent effect can be expected because it is free from troublesome work and there is no need to dispatch a pump manager unnecessarily.

According to the fourth aspect of the present invention, even if the primary pressure value of the pump becomes equal to or higher than the first set pressure value, an alarm is continuously issued until the reset switch is operated. Can always confirm that the primary pressure of the pump has dropped.

Even if the primary pressure value of the pump becomes equal to or higher than the second set pressure value, the pump is stopped until the reset switch is actuated. Therefore, the pump manager decreases the primary pressure of the pump and stops the pump. You can always check that there was.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration example of a direct water supply device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump 2 Control board 3 Pressure detecting means 4-1 First pressure setting means 4-2 Second pressure setting means 5-1 Comparator 5-2 Comparator 6 Equipment 7 Equipment 8 Equipment 9 Piping M Motor

Claims (5)

[Claims] 1. A direct water supply device in which a pump is directly connected to a pipe, water is sucked in from a primary inlet of the pump and discharged from a secondary outlet, thereby increasing the pressure in the secondary pipe to supply water. Pressure detection means for detecting a primary pressure value of the pump,
A primary pressure value of the pump detected by the pressure detecting means is compared with a first preset pressure value, and an alarm signal is output when the primary pressure value of the pump becomes equal to or less than the first preset pressure value. And comparing a primary pressure value of the pump detected by the pressure detecting device with a second set pressure value which is lower than the first set pressure value by a predetermined amount. A direct connection water supply device comprising a pump stop means for stopping the pump when the side pressure value becomes equal to or less than the second set pressure value. 2. A primary pressure value of the pump detected by the pressure detecting means is compared with a first preset pressure value set in advance, and a primary pressure value of the pump is determined to be equal to or greater than the first preset pressure value. The direct connection water supply device according to claim 1, wherein the alarm signal is automatically stopped when the water supply becomes inoperative. 3. A primary pressure value of the pump detected by the pressure detecting means is compared with a second preset pressure value, and the primary pressure value of the pump is equal to or greater than the second preset pressure value. The direct connection water supply device according to claim 1 or 2, wherein the pump is restarted when the water supply time is reached. 4. A primary pressure value of the pump detected by the pressure detecting means is compared with a first preset pressure value, and a primary pressure value of the pump is determined to be greater than or equal to the first preset pressure value. The water supply device according to claim 1, wherein the alarm is continuously output until the reset switch is operated. 5. A primary pressure value of a pump detected by the pressure detecting means is compared with a second preset pressure value set in advance, and a primary pressure value of the pump is determined to be greater than or equal to the second preset pressure value. The direct connection water supply device according to claim 1, wherein the pump is continuously stopped until the reset switch is operated.