JP2000337264A - Water supply device with reservoir tank for city water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water supply device with a reservoir tank for city water devised to certainly prevent inflow of water from a distributing pipe when water supply from the side of the distributing pipe is changed over to water supply by the reservoir tank and use the reservoir tank for a plural number of the water supply devices for city water in common. SOLUTION: The suction side of a booster pump device 10 is certainly blocked from a distributing pipe 2 by detecting lowering of pressure inside the distributing pipe 2 by a pressure sensor 3 and closing an automatic valve 5 in a water supply device devised to reserve water in a reservoir tank 6 by water pressure of a city water main pipe 1 and to supply water by the booster pump device 10 from the reservoir tank 6 even when water pressure of the distributing pipe 2 is lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply device for a water supply system for supplying water from a water distribution pipe to a terminal water supply tap, and more particularly, to a water supply system for a water supply system with a water storage tank provided with a closed tank on the suction side of a booster pump. Related to the device.

[0002]

2. Description of the Related Art In a conventional water supply apparatus, water supplied from a water distribution pipe is once drawn into a water receiving tank, and water is supplied to a terminal customer using a pressure pump. However, in this case, the water receiving tank becomes a sanitary problem.

[0003] In recent years, a water supply system of a so-called water supply system directly connected to a water supply pipe has been widely used, in which water is supplied by a pump directly connected to a water supply pipe without using a water receiving tank. This can be seen in Japanese Unexamined Patent Publication No. Hei 4-330127.

However, in this type of water supply device, the operation of the pump must be stopped immediately when the water supply is cut off. Therefore, emergency water cannot be secured. It was an issue to secure sufficient water.

Therefore, for example, Japanese Patent Application Laid-Open No. 10-299684 describes
In the publication, a water storage tank is installed on the suction side of the pump device, and water is stored in the water storage tank by the water pressure of a water distribution pipe, so that a fixed amount of water can be secured even in an emergency or when the construction is cut off. A water supply system for water supply with a function is proposed.

[0006]

The above prior art does not take into consideration the prevention of inflow of water from a water distribution pipe when the water supply is cut off, and is not sufficient in maintaining the water supply function when the water supply is cut off. There was a problem. In addition, the prior art described above does not say that the water storage function and the function of the pump device are sufficiently exhibited, and the water distribution pipe side necessary to be able to exert both functions to the maximum. There was a problem in relating the timing of shutoff from the water supply device after the water supply, the operation of the water storage tank, and the operation of the water supply device.

[0007] Further, not only during an emergency or when water is cut off during construction, but also during normal use, for example, when water supply restriction starts and the pressure of the water distribution pipe falls below a specified value,
The pump must be stopped to prevent water from being drawn in from the water distribution pipe side. When switching to the water supply operation, when the pressure on the water storage tank side becomes lower than the pressure on the water distribution pipe side from the check valve, water flows from the water distribution pipe side into the water storage tank side.

An object of the present invention is to reliably prevent water from flowing into a water storage tank from a water distribution pipe when switching to water supply from a water storage tank instead of water supply from the water distribution pipe side. Is to provide a water supply device for water supply with a water storage tank, which can be used for a plurality of water supply devices for water supply.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a water supply system for a water supply with a water storage tank provided with a water storage tank in a path from a water distribution pipe to a booster pump via a check valve. A pressure sensor, and an automatic valve disposed in a path between the check ring and the water storage tank,
When the water pressure in the water pipe falls below a predetermined pressure set in advance, the path between the water pipe and the water storage tank is shut off by the automatic valve.

Thus, according to the embodiment of the present invention,
The following operation is obtained. First, when the water pressure in the water distribution pipe is higher than the specified value, the pressure sensor detects this and opens the automatic valve, so that the normal use state is maintained, and the pressure is increased according to the water usage situation on the demand side. The pump device is operated and water is supplied from the distribution pipe side.

Next, when the water pressure in the water distribution pipe falls below a specified value, this is detected by the pressure sensor and the automatic valve is closed, so that the water supply from the water distribution pipe side can be reliably shut off. At this time, if water is used on the demand side, the pressure intensifying pump device is operated and water is supplied from the water storage tank.

Assuming that the water level in the water storage tank decreases with the use of this water and drops to the lower limit water level, this is detected by the lower limit water level detecting means, and the booster pump device is stopped. Furthermore, even if there are multiple sets of water supply devices,
The water storage tank can be shared.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a water supply device for water supply with a water storage tank according to the present invention will be described in detail with reference to the illustrated embodiments. 1 and 2 show a first embodiment of the present invention. Here, FIG. 1 shows a configuration of a water supply system, and FIG. 2 shows a control circuit.

First, in FIG. 1, 1 is a water main pipe, 2 is a water distribution pipe, 3 is a pressure sensor, 4 is a check valve, 5 is an automatic valve, 6 is a water storage tank, 7 is a suction and exhaust valve, and 8 is a lower limit. Water level detecting means, 9 is a suction pipe, 10 is a pressure booster pump, 11 is a bypass pipe, 12 is a check valve, 13 is a discharge side pressure tank, 1
4 is a pressure sensor, 15 is a control device, 16 is a water pipe, 17
Is a water supply device.

The water distribution pipe 2 serves to draw in water for water supply from the water main 1, and a pressure sensor 3 is provided on the water distribution pipe 2. The pressure sensor 3 functions to detect the water pressure in the water distribution pipe 2 and, for this purpose, includes a contact that opens and closes according to the pressure. The contact closes at a pressure of, for example, about 7 m or less, It is set to open at a water column of about 10m or more.

The check valve 4 is a so-called check valve, and functions to prevent water from flowing back from the water storage tank 6 to the water distribution pipe 2. The automatic valve 5 is an electromagnetic valve provided with an electromagnetic coil SV, and is a valve that is controlled to close when the water pressure on the water distribution pipe 2 side is equal to or lower than a specified value and to open when the water pressure exceeds a set value.

The water storage tank 6 is a closed tank.
An intake / exhaust valve 7 is provided at the top to allow air to enter and exit. As a result, water flows into the water storage tank 6 by the water pressure of the water distribution pipe 2, and is stored to a water level corresponding to the water pressure of the water distribution pipe 2.

The lower limit water level detecting means 8 has three types of water level detection levels E1, E2 and E3, and detects whether or not the water level of the water storage tank 6 is at the lower limit water level LWL (details will be described later). Used.

The booster pump device 10 is a so-called booster pump, which is used to maintain the required water pressure at the end of the customer at a predetermined pressure. It operates even when the pressure due to the water level in the tank 6 alone is insufficient.

The bypass pipe 11 is provided with a check valve 12, and when the water pressure in the water distribution pipe 2 is sufficiently higher than the predetermined pressure on the discharge side and it is not necessary to operate the booster pump apparatus 10, the booster pump apparatus is stopped. It bypasses 10 and works to supply water directly. The discharge-side pressure tank 13 is a so-called accumulator, which has an air reservoir inside and functions to absorb pressure fluctuations in the water pipe 16 and maintain (accumulate) pressure.

The pressure sensor 14 is provided on the discharge side of the pressure-intensifying pump device 10 and has a function of detecting a water supply pressure. The control device 15 includes a control circuit shown in FIG. 2 and functions to control the automatic valve 5 and the pressure-intensifying pump device 10. The water supply pipe 16 is a pipe to the end of the customer, and the water supply device 17 is a faucet with a cock attached to the end of the water supply pipe 16 or the like.

Next, in FIG. 2, PS is a pressure sensor 3
Thus, for example, it closes at about 7 m or less and opens at about 10 m or more. In this embodiment, the output of the sensor is indicated by a contact, but the present invention is not limited to this. For example, a continuous signal may be output according to the pressure.

The SVT is a timer which functions to set a delay time for shutting off the automatic valve 5. Therefore, when the contact point PS of the pressure sensor 3 is closed, time measurement is started, and a set time such as 10 seconds elapses. Thereafter, the normally closed contact SVTa is opened, and thereafter, when the contact PS is opened, the contact returns without delay and the contact SVTa is closed.

SV is an electromagnetic coil which functions to operate the automatic valve 5 as described above. In this embodiment,
A solenoid valve that opens when energized and closes when de-energized is used, but one that has the opposite operating conditions may be used, or an electrically operated valve that has the same function. May be used.

Reference numeral LV denotes a liquid level relay which functions to detect a lower limit water level LWL by a lower limit water level detecting means 8 provided in the water storage tank 6 and to output a lower limit water level signal Lva (represented by a contact point). Therefore, in the case of this embodiment, this signal L
va is closed when the lower limit water level LWL is detected and opened when the return water level is reached.

In this embodiment, the liquid level relay LV is provided as an external circuit. However, the liquid level relay LV may be incorporated as an electronic circuit in an operation control circuit of a water supply system for water supply to be described later, or may be incorporated as software. .

LVX is a relay which is operated by a contact Lva of the liquid level relay LV, and is provided with a contact LVXb which is closed when power is not supplied and opened when power is supplied. R is a display means, which is also operated by the contact Lva of the liquid level relay LV, and serves to display when there is no water in the water storage tank 6 for storing water. Y is a booster pump operation control circuit, and a relay LVX
The signal from the contact LVXb indicates that the water level in the water storage tank 6 is higher than the lower limit water level LWL, and is operable.

Although not shown, the pressure-intensifying pump operation control circuit Y includes a microcomputer, which detects the state of water use on the demand side by the discharge-side pressure sensor 14, and responds to the detection result. A program for properly controlling the operation of the water supply system is incorporated.

Next, the operation of this embodiment will be described. First, the water pressure of the water distribution pipe 2 is, for example, 10 m
The operation in a normal use state having the above sufficient values will be described. In this case, the water pressure in the distribution pipe is high enough,
The contact point PS of the pressure sensor 3 is open, and as a result, the contact point SVTa of the timer SVT is closed.

Therefore, the automatic valve 5 is energized by its coil SV and is open. As a result, the water in the water main 1 is discharged by the water pressure in the water distribution pipe 2, the check valve 4, The water is fed into the water storage tank 6 through the valve 5.

Here, assuming that the inside of the water storage tank 6 is initially filled only with air, the pressure of the air inside rises due to the sent water, the intake / exhaust valve 7 is opened, and the air is discharged from here. Water is discharged and the water level rises. Then, the water level continues to rise until the water level exceeds the lower limit water level LWL and all the air inside is discharged from the intake / exhaust valve 7 and replaced with water.

Here, when the water level in the water storage tank 6 exceeds the return water level, the liquid level relay LV opens its contact Lva. As a result, the relay LVX is de-energized,
The contact LVxb is closed, and the operation control circuit Y is made operable.

In this state, when water is used next on the demand side, for example, when the water supply device 17 is opened, the water pressure in the discharge side pressure tank 13 decreases, and this is detected by the pressure sensor 14 and the pressure increasing pump The apparatus 10 is started, and after the start, the pressure-intensifying pump apparatus 10 is operated in accordance with the pressure detected by the pressure sensor 14.
It controls the operation of the plant and supplies water to the demand side.

Next, the operation when the pressure of the water distribution pipe 2 drops below a prescribed value such as a water column of 7 m or less, for example, in case of an emergency or due to water cutoff of construction work will be described. Now
Assuming that the water pressure in the distribution pipe drops to 7 m or less, the contact point PS of the pressure sensor 3 is closed, and the timer SVT
Is activated and, as described above, after a set time of about 10 seconds,
Open the contact SVTa.

At this time, the coil SV is de-energized at this time, so that the automatic valve 5 is closed, and as a result, water from the water distribution pipe 2 is reliably shut off here. Unless it is opened, the water tank 6
There is no danger of water flowing into the system.

In this state, when water is used on the demand side, the booster pump device 10 is operated as described above to supply water. However, at this time, the water in the water storage tank 6 is supplied to the demand side and consumed as the pressure intensifying pump device 10 is operated, so that the water level in the water storage tank 6 decreases with the water supply. .

When the water level in the water storage tank 6 drops to the lower limit water level LWL, the contact L of the liquid level relay LV
Va is closed, whereby the relay LVX is energized, the contact Lxb is opened, and the display means R is operated.

As a result, at this point, a decrease in the water level of the water storage tank is displayed on the display means R, and when the contact point b of the relay LVX is opened, the booster pump operation control circuit Y responds and the booster pump device 10 To stop the operation of
Even if the water in the water storage tank 6 runs out, the booster pump device 10
There is no danger that the water will remain in operation, and the water in the water storage tank 6 will decrease and water can be reliably supplied until the water reaches the lower limit water level LWL. Can be used.

In this embodiment, a water level sensor is used to detect the lower limit water level of the water storage tank 6, but the lower limit water level is detected from the pressure corresponding to the lower water level of the water storage tank 6 by a pressure sensor or the like. You may do it.

Therefore, according to this embodiment, the water distribution pipe 1
When the water supply is switched from the inside of the water storage tank 6 to the water supply from the water storage tank 6, the water can be reliably prevented from flowing from the water distribution pipe 1 to the water storage tank 6 side.
The water supply operation can be performed by effectively using the water in the inside until it reaches the limit.

Next, another embodiment of the present invention will be described. FIG. 3 shows an embodiment in which the present invention is applied to a large-scale apartment house or the like in which a plurality of buildings to be supplied with water are connected. In FIG. 3, each of the two buildings is a booster pump. This figure shows a case in which two sets of water supply devices for water supply, which have the device 10 and supply tap water to the water supply device 17 of each customer via a water pipe 16, are applied as A and B, respectively. .

At this time, a common pipe 18 is used to connect the suction pipes 9 of the respective water supply devices A and B, and the common pipe 18 is provided with the water storage tank 6, whereby one water storage tank 6 is provided. Are shared so that water can be supplied, and the other configuration is the same as the embodiment of FIG.

Therefore, according to the embodiment shown in FIG.
When switching to water supply from inside the water storage tank 6 instead of water supply from the water distribution pipe 1 side, water can be reliably prevented from flowing from the water distribution pipe 1 to the water storage tank 6 side. The water supply operation can be performed by effectively using the water in the inside until it reaches the limit.

[0044]

According to the present invention, when the water pressure in the water distribution pipe falls below a predetermined value, the pressure sensor provided on the water distribution pipe side of the check valve detects this and shuts off the automatic valve. As a result, in any event, such as when the booster pump is accidentally operated, it is ensured that water on the water distribution pipe side will not be drawn into the demand side during water supply restriction or in an emergency. be able to. Further, according to the present invention, during the water supply restriction or in an emergency, there is no possibility that the water on the water distribution pipe side is drawn into the demand side, so that the advantage of using the water storage tank can be fully utilized and the water storage tank can be used. The water inside can be used effectively and the water supply can be continued to the limit.

Further, according to the present invention, since the water storage tank can be shared by a plurality of water supply devices, the facility cost can be minimized while ensuring the water storage function.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a water supply device for water supply with a water storage tank according to the present invention.

FIG. 2 is a block diagram showing a control circuit according to one embodiment of the present invention.

FIG. 3 is a configuration diagram showing another embodiment of the water supply device for water supply with a water storage tank according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water main pipe 2 Water distribution pipe 3 Pressure sensor 4 Backflow prevention valve 5 Automatic valve 6 Water storage tank 7 Intake / exhaust valve 8 Lower limit water level detection means 9 Suction pipe 10 Booster pump device 11 Bypass pipe 12 Check valve 13 Pressure tank 14 Pressure sensor 15 control circuit 16 water pipe 17 water supply equipment

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takahisa Sakai 4-6 Kanda Surugadai, Chiyoda-ku, Tokyo F-term in Hitachi, Ltd. (reference) 3H020 AA01 AA03 AA07 BA04 BA11 BA18 CA01 CA03 CA07 DA01 DA08 DA11 DA21 DA22 DA28 EA08 EA09 EA12 3H045 AA06 AA09 AA12 AA14 AA23 AA39 BA20 BA28 BA31 CA02 CA03 CA14 DA01 DA11 DA12 DA31 DA32 DA41 DA47 EA34 EA35 EA38

Claims (4)

[Claims] 1. A water supply device with a water storage tank having a water storage tank in a path from a water distribution pipe to a booster pump via a backflow prevention valve, wherein: a pressure sensor for detecting a water pressure in the water distribution pipe; An automatic valve disposed in a path between the valve and the water storage tank is provided, and when a water pressure in the water distribution pipe falls below a predetermined pressure set in advance, a path between the water distribution pipe and the water storage tank is provided. A water supply device for a water supply with a water storage tank, wherein the water supply device is configured to be shut off by an automatic valve. 2. The invention according to claim 1, wherein the water storage tank is provided with a suction / exhaust valve at a top portion thereof, and the water flowing from the water distribution pipe reaches the predetermined water level via the suction / exhaust valve. Discharging the internal air, and when the water level in the water storage tank is reduced by the operation of the booster pump device, external air is introduced from the intake / exhaust valve. Water supply system for water supply with tank. 3. The water storage tank according to claim 1, wherein the water storage tank includes detection means for detecting a water level of water stored therein, and the water level of the water stored in the water storage tank is detected by the detection means. Is greater than or equal to a predetermined lower limit water level set in advance,
A water supply device for water supply with a water storage tank, characterized in that the booster pump device is configured to be operated. 4. The water supply apparatus according to claim 1, wherein at least a plurality of water supply units including a water distribution pipe and a booster pump device connected to the water distribution pipe are provided. A water supply device for a water supply with a water storage tank, wherein the water supply device is configured to be shared by a plurality of water supply devices.