JP3872437B2 - Water supply system in waterworks - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a water supply system in a water supply, and more particularly to a pressurized water supply system, which can be stably applied to a low ward water supply system and a high ward water supply system regardless of fluctuations in the amount of water used and a decrease in main water pressure. Can supply water, pressurize high district water supply using main water pressure, reduce main water pressure (stored in water receiving layer to zero pressure), and reduce pressure close to constant pressure By performing district water supply, power consumption for the water supply pressure can be reduced.
[0002]
[Prior art]
In the water supply system, there are a low water supply system that supplies water to relatively low districts and a high ward water supply system that supplies water to relatively high districts. By adjusting the opening, it is common to reduce the amount of water stored in the water receiving tank, store it in this water receiving tank, and supply water to the low water supply system and the high water supply system at the specified water pressure with each pump. Regardless of fluctuations in water usage in the water mains (such as fluctuations in water pressure due to fluctuations in water usage due to time zones), low ward water supply systems, high ward water supply system water usage fluctuations, In general, water is supplied to the water supply system at a predetermined pressure.
In the conventional water supply system in such a water supply, since the water receiving tank is an open type, in both the low ward water supply system and the high ward water supply system, from zero pressure (water receiving tank pressure) to the low ward water supply system It is supposed to pressurize with each pump to supply water pressure (for example, 0 * 15 Mpa) or to supply water pressure (for example, 0.5-0.55 Mpa) to a high ward water supply system. For this reason, the water pressure energy of the water main is discharged to the atmosphere in the water receiving tank, and is wasted. (However, there is no document describing this prior art).
[0003]
In addition, water storage in the water receiving tank is performed when there is little movement of water in the main water supply and when the water usage is low at night and during the day when the main pressure rises. By the way, when the replenishment amount from the water main is insufficient with respect to the water supply to the low ward water supply system and the high ward water supply system, this shortage is compensated with the water storage in the receiving tank so that there is no shortage of water supply. Yes. Such an abnormal situation that causes a shortage of water supply occurs when a fire extinguishes due to a fire, or when hospitals start their activities and a large amount of water is used all at once. Pressurized water supply system for receiving tank, low ward water supply system, and high ward water supply system is designed and operated so as not to hinder, but in this case too, water pressure energy of the water main is not used, so pressurized water supply The power consumption of the pump is large.
[0004]
On the other hand, when the replenishment amount from the water main to the water receiving tank and the water usage by the low ward water supply system and the high ward water supply system are almost balanced, the water stored in the water receiving tank is not consumed. If the exchange of water is slow and the consumption is low, the water in the water receiving tank may be deteriorated (dead water). Therefore, it is necessary to control the replenishment to the water receiving tank so that the water stored in the water receiving tank is completely replaced in a certain time by water supply from the water receiving tank to the low ward water supply system and the high ward water supply system.
[0005]
[Problems to be solved by the invention]
The present invention aims to solve the above-mentioned problems in the prior art in the water supply system for the low water supply system and the high water supply system of the water supply, and by effectively utilizing the water pressure energy of the water main, The power consumption of the pump for pressurized water supply to the high-pressure and high-pressure water supply systems is reduced, and the water in the receiving tank can be put in naturally regardless of the amount of water used in the low and high water supply systems. As an alternative, the task is to devise water supply systems for the low ward water supply system and the high ward water supply system.
[0006]
[Means for Solving the Problems]
The water supply system devised to solve the above problems is a water receiving tank connected to the water main through a flow control valve, and the low water supply system and the high water supply system are connected to the water receiving tank. On the premise of a water supply system for waterworks that supplies water at a predetermined water pressure to each of the low ward water supply system and the high ward water supply system, the following (1) to (6) are configured.
(1) A sealed pump chamber is provided in the water receiving tank, and a branch pipe from the water main is connected to the pump chamber via a flow rate control valve.
(2) A replenishment water pipe is provided in the pump chamber, and the replenishment water pipe is opened to the water receiving tank through a check valve and a flow rate control valve.
(3) A sealed tank type submersible pump is installed in the pump chamber, and the discharge pipe of the submersible pump is connected to the water supply pipe of the high ward water supply system.
(4) Furthermore, the branch pipe from the water main is opened to the water receiving tank through the flow rate control valve.
(5) The low water supply system water supply pipe is connected to the water receiving tank via a flow rate control valve.
(6) The drive motor of the submersible pump is a variable speed motor by inverter control.
[0007]
[Action]
The water receiving tank can store a predetermined amount of water, and is supplied to the water receiving tank from a branch pipe of a water main through a flow rate adjusting valve, and is maintained at a predetermined water level by adjusting the amount of supply. The water tank is installed in the hill area so that the water supply pressure does not fall below 0.15 Mpa.
[0008]
On the other hand, the booster pump (submersible pump) is always filled with water and pressurized by the water main water pressure, and by adjusting the opening of the flow control valve provided in the branch pipe from the water main, a predetermined pressure ( 0.15 Mpa) or less.
The submersible pump pressurizes the pump chamber pressure up to the water supply pressure to the high ward water supply system (for example, 0.5 to 0.55 MPa so that the water supply water pressure becomes constant). The rotation speed is controlled so that the discharge pressure is maintained at the above-described feed water pressure (the terminal pressure is constant control, for example, 0.15 Mpa at the end).
The power consumption of the submersible pump in this case is required for pressurizing the difference between the pump chamber suction pressure (for example, 0.15 to 0.3 Mpa) and the discharge pressure (for example, 0.5 to 0.55 Mpa). Power consumption is reduced by the pressure in the pump chamber due to the main water pressure (for example, 0.2 to 0.4 Mpa).
[0009]
In addition, a part of the water supply from the water main (intake main) is diverted to the branch pipe, and the branch flow rate is adjusted by the flow control valve of this branch pipe (for example, the amount of water used at night and during the day is small). ) Add this to the water tank. And the water level of a water receiving tank is hold | maintained by the adjustment of the replenishment amount to this water receiving tank at the water supply pressure (for example, 0.15 Mpa or more by the altitude of a hill area) to a low ward water supply system. The water supply pressure to the low ward water supply system is the water tank installation pressure provided in the hill area, and there is no pressurization by the submersible pump for the water supply to the low ward water supply system. The power consumption for pressure is zero.
[0010]
In addition, when the water consumption in the Takaku water supply system is abnormally high and the flow rate from the branch pipe from the water main is insufficient, the check valve of the replenishment water pipe connected to the pump room opens automatically, The main water suction pressure is not increased below 0.15 Mpa, and the water is pressurized with a submersible pump together with the main water suction water to supply the water to the high ward water supply system. In this case as well, the pressure can be increased to a predetermined pressure (for example, 0.5 to 0.55 Mpa so that the terminal pressure is constant 0.15 Mpa) by adjusting the rotation speed of the submersible pump.
[0011]
Further, normally, the water in the water receiving tank is always consumed as the water supplied to the low ward water supply system, and the water in the water receiving tank is constantly replaced. Therefore, there is no possibility that the water in the water receiving tank stays and deteriorates. On the other hand, the water supply to the high ward water supply system is directly supplied to the high ward water supply system from the water main through the pump room and the submersible pump (vertical submersible booster pump) without passing through the water receiving tank.
[0012]
Embodiment 1
Embodiment 1 is that the submersible pump in the solution is a vertical submersible booster pump.
[0013]
Embodiment 2
In the second embodiment, two or more water receiving tanks in the solving means are arranged in parallel, and one submersible pump of each receiving tank is always operated with respect to the water supply pipe to the high ward water supply system, and one unit is set as a spare and is operated alternately. It is connected in parallel.
[0014]
Embodiment 3
Embodiment 3 is that, in Embodiment 2, a low-division water supply system water supply pipe is connected in parallel to each water receiving tank.
[0015]
[Embodiment]
Next, examples will be described with reference to the drawings.
In this embodiment, two water receiving tanks 1 having a water storage capacity of 50 to 1000 t are provided in parallel (depending on the water supply population), and each water receiving tank 1 is provided with a sealed pump chamber 2. The water receiving tank 1 is maintained at a water level of a predetermined water storage amount. At this time, the position of the water receiving tank is set in a hill area so that the water supply pressure does not become 0.15 Mpa or less.
[0016]
Submersible pumps (vertical submersible booster pumps) with a maximum capacity of 0.3 to 5.00 m ³ / min (maximum rotation speed 3000 rpm) (depending on the water supply population) in the pump chambers 2 and 2 of the left and right water receiving tanks 1 and 1, respectively. ) 3 is installed. These left and right submersible pumps 3 and 3 are connected to the discharge pipe 4 in parallel, and a flow rate adjusting valve (sluice valve) 5 is interposed between the submersible pump 3 and the discharge pipe 4.
The left and right pump chambers 2 and 2 are connected in parallel to the branch pipe 6 from the water main. An electric flow control valve 7 is interposed between the branch pipe 6 and the pump chamber 2 so that the water supply pressure to the pump chamber 2 (the water supply pressure of the primary side main water supply residents) does not fall below 0.15 Mpa. Based on the pressure measurement signal of the pump chamber 2, the opening degree of the electric flow control valve 7 is automatically adjusted.
[0017]
The discharge pipe 4 is connected to a high section water supply pipe 8 through a flow rate adjusting valve (sluice valve) 9. The left and right water receiving tanks 1 and 1 are usually at a common water level, but can be made independent of each other. Also, depending on the amount of water used, the submersible pump performs pressurized water supply either on the left or right, or in both operations.
[0018]
Further, a replenishment water pipe 11 provided in the pump chamber 2 is opened to the water receiving tank 1, and a check valve and a flow rate control valve (sluice valve) 12 are provided in the replenishment water pipe 11, so When the amount of water used in the system is abnormally large, the submersible pump fully rotates, and when the water supply from the branch pipe of the water main is insufficient, the check valve of the replenishment water pipe 11 is automatically opened, and the water receiving tank Water is replenished from 1 to the pump chamber 2.
Moreover, the water supply pipe 13 to the low ward water supply system is connected to the left and right water receiving tanks 1 and 1 in parallel with each other so that water is supplied to the low ward at a water pressure of 0.15 Mpa by the altitude position (high ground) of the water receiving tank 1. It has become.
[0019]
Since the water supply system is operated for 24 hours, water is constantly supplied from the water main through the branch pipe 6 to the pump chamber at a water pressure of 0.15 Mpa or more, and the water supply to the discharge pipe 4 by the submersible pump 3 varies. Regardless of this, by adjusting the opening degree of the electric flow control valve 7 so that the water pressure in the pump chamber 2 is maintained at approximately 0.15 MPa or more, the replenishment water pressure from the branch pipe 6 to the pump chamber 2 is automatically substantially reduced. It is controlled not to be less than 0.15 Mpa.
The water in the pump chamber 2 is pressurized by the submersible pump 3 so as to be constant at the end, and is supplied to the discharge pipe 4. The feed water pressure from the submersible pump 3 to the discharge pipe 4 is automatically and constantly controlled by adjusting the rotation speed of the submersible pump, regardless of fluctuations in the amount of water used in the high section water supply system. The water pressure-fed to the discharge pipe 4 is sent to the high section water supply pipe 8 through a flow rate adjusting valve (sluice valve) 9. Also, the left and right water receiving tanks 1 and 1 connected in parallel to each other provided on the height of the altitude supply water to the low ward water supply pipe 14 at a water pressure of 0.15 Mpa or more.
[0020]
When the amount of water used in the low ward water supply system is abnormally large, the water level of the water receiving tank tends to decrease, so the opening of the electric flow control valve 10 to the water receiving tank is expanded, and the water receiving tank 1 from the branch pipe 6 is expanded. If the amount of water supply increases, but it is still insufficient, it is decided to report the abnormality due to the lowering of the abnormal water level in the water receiving tank, and the staff will confirm the cause on site. Since the rotation speed of the submersible pumps 3 and 3 is controlled and the discharge amount is increased for high district water supply, the pump is provided with “margin” so that the supply water pressure in the discharge pipe 4 is kept constant.
[0021]
When the amount of water used in the Takaku water supply system is abnormally large, the opening degree of the electric flow rate survey valve 7 is expanded, and the check valve and flow rate control valve (sluice valve) 12 of the replenishment water pipe 11 of the water receiving tank are opened. The water supply pressure from the branch pipe 6 of the water main is kept at 0.15 Mpa (adjusted by the electric flow control valve 7), and the water sucked from the water receiving tank 1 is pressurized by the submersible pump 3 to the discharge pipe 4. Send it in.
[0022]
An unusual situation where the water usage of the high water supply system and the low water supply system is abnormally high and the water level of the water receiving tank decreases (for example, when a main breakage or a fire occurs due to an earthquake) does not occur frequently.
If there is a village in front of the water receiving tank, water is supplied to the village from the branch of the water main in front of the water receiving tank.
[0023]
As described above, according to the water supply system of the present invention, the water supply pressure to the high ward water supply system uses the water pressure of the main pipe as it is, pressurizes the shortage with the submersible pump, and supplies this to the high ward water supply system. Compared to the conventional water supply system that pressurizes the water in the open tank and supplies it to the low and high water supply systems, the power consumption of the water supply pressure pump is greatly reduced. be able to.
In addition, the water pressure in the water receiving tank is maintained at the water supply pressure in the low water supply system, and water is supplied from the water receiving tank to the low water supply system by natural flow, so the water receiving tank is used regardless of the amount of water used in the low water supply system. The water inside is always changed. Therefore, there is no problem that water is deteriorated (dead water) without water staying in the water receiving tank.
[Brief description of the drawings]
FIG. 1 is a plan view of an embodiment.
FIG. 2 is a schematic longitudinal sectional view of an embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Receiving tank 2 ... Sealed pump chamber 3 ... Submersible pump (Vertical submersible booster pump)
4 ... Discharge pipe 5 ... Flow rate control valve 6 ... Branch pipe 7 ... Electric flow rate control valve 8 ... High ward water supply pipe 9 ... Flow rate control valve 10 ... Electric flow rate control valve 11 ... Replenishment water pipe 12 ... Flow control valve 13 ... Water supply pipe 14 for low ward water supply system ... Low ward water supply pipe MH ... Manhol

Claims (4)

A water receiving tank connected to the water main through a flow control valve, and a low ward water supply system and a high ward water supply system are connected to the water receiving tank. In the water supply system of the water supply system that supplies water with water pressure,
A sealed pump chamber is provided in the water receiving tank, and a branch pipe from the water main is connected to the pump chamber via a flow control valve.
A replenishment water pipe is provided in the pump chamber, and the replenishment water pipe is opened to the water receiving tank through a check valve and a flow rate adjustment valve.
A closed tank type submersible pump is installed in the pump chamber, and the discharge pipe of the submersible pump is connected to the water supply pipe of the high ward water supply system,
Furthermore, the branch pipe branched from the water main is opened to the water receiving tank through the flow control valve,
Low water supply system water supply pipe is connected to the above water tank through a flow control valve,
A water supply system for waterworks in which the drive motor of the submersible pump is a variable speed motor controlled by an inverter. The water supply system for waterworks according to claim 1, wherein the submersible pump is a vertical submersible booster pump. The water supply system for waterworks according to claim 2 , wherein two or more of the water receiving tanks are arranged in parallel, and the underwater booster pumps of the water receiving tanks are connected in parallel to a water supply pipe to a high ward water supply system. 4. The water supply system for waterworks according to claim 3, wherein the water supply pipes of the low ward water supply system are connected in parallel to the water receiving tanks.

Images