JP2004238825A - Water supply system in water works - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water supply system low in rate of electricity used for water supply with gentle water supply (always at a constant terminal pressure of 0.15 Mpa) and absolutely secure with easy control operation. <P>SOLUTION: A water receiving tank 1 is connected to a water main through a flow regulating valve, and a low area water supply system and a high area water supply system are connected to the water receiving tank. The water pressure of the water main is used as it is, and the difference between suction pressure and water supply pressure to the high area water supply system is pressurized by an submerged pump 2 and supplied to the high area water supply system. Water from the water receiving tank is supplied as it is with natural pressure to the low area water supply system, and water in the water receiving tank is constantly changed. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
[Industrial applications]
The present invention relates to a water supply system in a water supply system, particularly to a pressurized water supply system, and stably supplies water to a low-area water supply system and a high-area water supply system irrespective of fluctuations in water usage and a decrease in main water pressure. Water can be supplied, and the main area water pressure is used to pressurize the high-area water supply, and the main water pressure is reduced (to 0 in the reservoir) and reduced at a pressure close to a constant pressure. By performing ward water supply, power consumption for the water supply pressure can be reduced.
[0002]
[Prior art]
There are two types of water supply systems: a low-area water supply system that supplies water to relatively low districts, and a high-area water supply system that supplies water to relatively high areas. By adjusting the opening degree, a predetermined amount of water is decompressed and stored in a receiving tank, taken in from the receiving tank, and supplied to the low- and high-district water supply systems at a predetermined water pressure with respective pumps. , Regardless of fluctuations in water pressure in the water main (water pressure fluctuations due to fluctuations in water usage over time), fluctuations in water usage in the low ward water supply system and high ward water supply system, Generally, water is supplied to the water supply system at a predetermined pressure.
In a conventional water supply system for such a water supply system, since the water receiving tank is open, both the low ward water supply system and the high ward water supply system are switched from zero pressure (water receiving tank pressure) to the low ward water supply system. Each pump is used to pressurize the water supply pressure (for example, 0.15 Mpa) or the water supply pressure to the high-area water supply system (for example, 0.5 to 0.55 Mpa). For this reason, the hydraulic energy of the water main is released to the atmosphere in the water receiving tank and is wasted wastefully (however, there is no literature describing this conventional technique).
[0003]
In addition, the water is stored in the receiving tank when the movement of the water in the service water main is small, and when the water pressure is low at night and during daytime when the main pressure is increased. By the way, when the amount of water supply from the water main is insufficient for the water supply to the low ward water supply system and the high ward water supply system, make up for this shortage by storing the water in the receiving tank so that there is no shortage of water supply. I have. Abnormal situations that cause such a shortage of water supply occur during fire extinguishing activities due to the occurrence of fires, when hospitals, etc. start activities and use a large amount of water all at once. The pressurized water supply system for the water receiving tank, low ward water supply system, and high ward water supply system is designed and operated so as not to cause any problems. The power consumption of the pump is large.
[0004]
On the other hand, when the amount of water supplied from the water main to the receiving tank is almost balanced with the amount of water used by the low and high ward water supply systems, the water in the receiving tank is not consumed. If the water exchange is gradual and the state of low consumption continues for a long time, the water in the receiving tank may be deteriorated (dead water). Therefore, it is necessary to control the replenishment of the water receiving tank so that the water stored in the water receiving tank is completely replaced within a certain period of time by supplying water from the water receiving tank to the low-area water supply system and the high-area water supply system.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to solve the above-mentioned problems of the prior art in a water supply system to a low-area water supply system and a high-area water supply system of a water supply system. The power consumption of the pump for pressurized water supply to the system and high-pressure water supply system is reduced, and the water in the receiving tank is naturally supplied regardless of the amount of water used in the low-area water supply system and the high-area water supply system. Instead, it is an object to devise a water supply system 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-mentioned problem has a water receiving tank connected to a water main via a flow control valve, and the low water supply system and the high water supply system are connected to the water receiving tank. Assuming a water supply system of a water supply system that supplies water to the low-ward water supply system and the high-ward water supply system at a predetermined water pressure, the system is configured by the following (1) to (6).
(1) A closed pump chamber is provided in the water receiving tank, and a branch pipe from a water main is connected to the pump chamber via a flow control valve.
(2) A refill water pipe is provided in the pump chamber, and the refill water pipe is opened to a water receiving tank via a check valve and a flow control valve.
(3) A closed tank type submersible pump is installed in the pump room, and the discharge pipe of the submersible pump is connected to a water supply pipe of a high-area water supply system.
(4) Further, the branch pipe from the water main is opened to the water receiving tank via the flow control valve.
(5) A water supply pipe of a low-distance water supply system is connected to the water receiving tank via a flow control valve.
(6) The drive motor of the submersible pump is a variable speed motor controlled by an inverter.
[0007]
[Action]
The water receiving tank can store a predetermined amount of water, and is supplied to the water receiving tank through a flow control valve from a branch pipe of a water main pipe, and is maintained at a predetermined water level by adjusting the replenishing amount. 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.
[0008]
On the other hand, the booster pump (submersible pump) is always filled with water, is pressurized by the water main water pressure, and is adjusted to a predetermined pressure (by adjusting the opening degree of the flow control valve provided on the branch pipe from the water main). 0.15 Mpa).
The submersible pump pressurizes the pump room pressure to the water supply pressure to the high-area water supply system (for example, 0.5 to 0.55 Mpa so that the water supply water pressure becomes constant). Then, the rotation speed is controlled so that the discharge pressure is maintained at the above-described feedwater pressure (terminal pressure constant control, for example, 0.15 Mpa at the terminal 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). The power consumption is reduced by the pressure (for example, 0.2 to 0.4 MPa) of the pump chamber due to the water pressure of the main pipe.
[0009]
In addition, a part of the water supply from the water main (inlet main) is diverted to the branch pipe, and the branch flow rate is adjusted by a flow control valve of the branch pipe (for example, the nighttime and daytime water consumption is small). Replenish this into the receiving tank. Then, by adjusting the replenishing amount of the water receiving tank, the water level of the water receiving tank is maintained at the water supply pressure to the low-area water supply system (for example, 0.15 Mpa or more depending on the altitude of the hill area). The water supply pressure to the low ward water supply system is the pressure of the water receiving tank installed 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]
Also, if the water usage in the high ward water supply system is abnormally large and the flow rate from the main pipe to the branch pipe is insufficient, the check valve of the replenishment water pipe connected to the pump room will open automatically, and the And the main pipe suction pressure is kept below 0.15 Mpa, and the water is pressurized with a submersible pump together with the main pipe suction water and supplied to the high section water supply system. Also in this case, by adjusting the rotation speed of the submersible pump, the pressure can be increased to a predetermined pressure (for example, 0.5 to 0.55 Mpa so that the terminal pressure becomes constant at 0.15 Mpa).
[0011]
Further, usually, the water in the water receiving tank is always consumed as water supply to the low-area 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 via the pump room and the submersible pump (vertical underwater 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 solution are arranged in parallel, and one underwater pump of each water receiving tank is always operated for the water supply pipe to the high-area water supply system, and one is set as a spare and alternately operated. That is, they are connected in parallel.
[0014]
Embodiment 3
Embodiment 3 is that in Embodiment 2, a water supply pipe of a low-distance water supply system is connected to each of the water receiving tanks in parallel.
[0015]
Embodiment
Next, embodiments will be described with reference to the drawings.
In this embodiment, two water receiving tanks 1 each having a water storage capacity of 50 to 1000 t are provided in parallel (depending on the water supply population), and each of the water receiving tanks 1 is provided with a sealed pump chamber 2. The water receiving tank 1 is maintained at a predetermined water level. At this time, the position of the water receiving tank 1 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 receiving tanks 1 and 1 respectively. 3) is installed. These left and right submersible pumps 3 are connected to the discharge pipe 4 in parallel with each other, and a flow control valve (sluice valve) 5 is interposed between the submersible pump 3 and the discharge pipe 4.
The left and right pump chambers 2, 2 are connected in parallel with each other to a branch pipe 6 from a 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 mains water supply residents) does not become 0.15 Mpa or less. The opening of the electric flow control valve 7 is automatically adjusted based on the pressure measurement signal of the pump chamber 2.
[0017]
The discharge pipe 4 is connected to a high section water supply pipe 8 via a flow control valve (sluice valve) 9. The left and right water receiving tanks 1 and 1 usually have a common water level, but they can be independent of each other. Further, depending on the amount of water used, the submersible pump supplies pressurized water by either left or right operation or both operations.
[0018]
In addition, a replenishing water pipe 11 provided in the pump chamber 2 is open to the water receiving tank 1, and a check valve and a flow control valve (sluice valve) 12 are provided in the refilling water pipe 11. When the amount of water used in the system is abnormally large, the submersible pump rotates at full speed, and if water supply from the branch pipe of the water main is insufficient, the check valve of the supplementary water pipe 11 automatically opens, and The pump chamber 2 is refilled with water from 1.
Further, a 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, and water is supplied to the low ward at a water pressure of 0.15 Mpa depending on the elevation position (elevation) of the water receiving tank 1. It has become.
[0019]
Since the water supply system of the water supply system is operated for 24 hours, water is constantly supplied to the pump room at a water pressure of 0.15 Mpa or more from the water main via the branch pipe 6, and the water supply to the discharge pipe 4 by the submersible pump 3 varies. Regardless, by adjusting the opening 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 supply 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 supplied to the discharge pipe 4. The water supply pressure from the submersible pump 3 to the discharge pipe 4 is automatically controlled to be constant by adjusting the rotation speed of the submersible pump, irrespective of fluctuations in the water usage of the high-area water supply system. Then, the water pressure-fed to the discharge pipe 4 is sent to the high-area water supply pipe 8 via a flow rate control valve (sluice valve) 9. The left and right water receiving tanks 1, 1 provided on the hill at the altitude and connected in parallel to each other supply water to the low-area water supply pipe 14 at a water pressure of 0.15 Mpa or more.
[0020]
When the water usage of the low-area water supply system is abnormally large, the water level in the water receiving tank tends to decrease. Therefore, the opening of the electric flow control valve 10 to the water receiving tank is expanded, and If the amount of water supplied to the tank increases, but it is still insufficient, a notification will be sent to the staff due to a decrease in the abnormal water level in the receiving tank, and the staff will confirm the cause at the site. The rotation speed of the submersible pumps 3 and 3 is controlled during the high water supply, and the discharge amount increases. Therefore, the pump is provided with “margin” so that the water supply pressure of the discharge pipe 4 is kept constant.
[0021]
When the water usage of the high ward water supply system is abnormally large, the opening of the electric flow rate check valve 7 is expanded, and the check valve and the flow rate control valve (sluice valve) 12 of the replenishing water pipe 11 of the receiving tank are opened. The water sucked from the water receiving tank 1 is pressurized by the submersible pump 3 and supplied to the discharge pipe 4 while maintaining the water supply pressure from the branch pipe 6 of the water main pipe at 0.15 Mpa (adjusted by the electric flow control valve 7). Send in.
[0022]
Unusual situations in which the water usage in the high-area water supply system and the low-area water supply system are abnormally large and the water level in the receiving tank lowers (for example, when the main pipe is damaged or a fire occurs due to an earthquake) do not occur frequently.
When there is a settlement in front of the water receiving tank, water is supplied to the settlement from a branch pipe of a 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-area water supply system uses the water pressure of the incoming main pipe as it is, pressurizes the shortage with a submersible pump, and applies this to the high-area water supply system. Power supply of the pressurized water supply pump compared to the conventional water supply system that pressurizes the water in the open tank and supplies it to the low-area water supply system and the high-area water supply system. be able to.
Also, since the water pressure in the receiving basin is maintained at the water supply pressure of the low ward water supply system and water is supplied from the receiving basin to the low ward water supply system by natural flow, regardless of the amount of water used in the low ward water supply system, The water inside is constantly replaced. Therefore, there is no problem that the water is degraded (dead water) without 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 vertical sectional view of the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Receiving tank 2 ... Sealed pump room 3 ... Submersible pump (vertical submersible booster pump)
4 ... discharge pipe 5 ... flow control valve 6 ... branch pipe 7 ... electric flow control valve 8 ... high section water supply pipe 9 ... flow control valve 10 ... electric flow control valve 11 ... replenishing water pipe 12 ... flow rate control valve 13 ... water supply pipe to low area water supply system 14 ... low area water supply pipe MH ... manhol

Claims (4)

A water receiving tank connected to the water main via a flow control valve, and a low-area water supply system and a high-area water supply system are connected to the water-receiving tank. In a water supply system for water supply using 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 refill water pipe is provided in the pump chamber, and the refill water pipe is opened to a receiving tank via a check valve and a flow control valve,
A closed tank type submersible pump is installed in the pump room, and the discharge pipe of the submersible pump is connected to a water supply pipe of a high-area water supply system,
Furthermore, the branch pipe branched from the water main is opened to a water receiving tank via a flow control valve,
A water supply pipe of a low-distance water supply system is connected to the water receiving tank via a flow control valve,
A water supply system for a water supply system, wherein a drive motor of the submersible pump is a variable speed motor controlled by an inverter. The water supply system for a water supply system according to claim 1, wherein the submersible pump is a vertical submersible booster pump. The water supply system according to claim 1, wherein two or more of the water receiving tanks are arranged in parallel, and the submersible booster pumps in each of the water receiving tanks are connected in parallel to a water supply pipe to a high-area water supply system. The water supply system for a water supply system according to claim 3, wherein a water supply pipe of the low-ward water supply system is connected to each of the water receiving tanks in parallel.

Images