JPH0921146A - Middle water supply system using roof drain pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve utilization of rainwater and efficiency of a system therefor while reducing cost. SOLUTION: A non-potable water pipe 10, doubling as a roof drainpipe, is arranged between a rainwater storage tank 8 installed on the rooftop and an underground not-potable water tank 9 installed underground, and a first pump 11 for pressure conveyance and a first check valve 12 are provided at the rainwater storage tank 8 side on the non-potable water pipe 10 while a second pump 13 for pressure conveyance and a second check valve 14 are provided at the underground non-potable water tank 9 side. Waste water popes 16 connecting with flush toilets are arranged between the check valves while a rainwater conducting pipe 19 for conducting rainwater in the rainwater storage tank 8 to the underground waste tank 9 through a first valve 20 and a drainpipe 21 for discharging surplus or used waste water to the outside through a second valve 22 are connected to the non-potable water pipe 10. Furthermore, a water conducting pipe 24 for conducting water from a water pipe 6 through a third valve 23 is connected to the underground waste water tank 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rainwater supply system that collects rainwater and uses it as toilet flush water for flush toilets in order to improve the utilization rate of rainwater. It is possible to improve the efficiency of the system,
The present invention relates to a medium water supply system using a roof drain pipe.

[0002]

2. Description of the Related Art In recent years, effective use of water resources has been required due to lack of water due to lack of rainfall, and in some cities,
Large offices with a total floor area of more than 30,000 m ² are instructed to introduce a so-called intermediate water supply system that uses rainwater as flush water for flush toilets. in this case,
Since the water supply piping system will be double piping and it will be necessary to install a new medium water tank, it will save water, but an increase in equipment costs cannot be avoided. This is because in Japan, the supplied water is called clean water, and the quality of water that comes out of the spout is maintained so that it can be drunk, and it is distinguished from water that cannot be drunk. It is different from the culture and cultural sphere, which is basically dependent on water or boiling water.

On the other hand, in urban areas, the amount of rainwater that penetrates underground is decreasing due to the paving of the land surface, and the load on the sewer is increasing, so installation of a primary reservoir for rainwater is often instructed, Although the use of rainwater and the reduction of the load on the sewer are being promoted under the guidance of the government, in order to use this rainwater as tap water, it is necessary to install separate pipes and storage tanks as described above, and bear the cost burden. Therefore, the improvement of rainwater utilization and the improvement of system efficiency are required.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to use a roof drain pipe installed in any building without newly providing a dedicated water pipe in a water supply system that actively uses rainwater. By doing so, it is to provide a gray water supply system using a roof drain pipe that can reduce equipment costs. Another object of the present invention is to provide a roof drain pipe capable of improving the system efficiency by maximally utilizing rainwater to improve its utilization rate and optimally controlling the intermediate water supply system. The purpose is to obtain the used water supply system.

[0005]

In order to solve the above-mentioned problems, a drain water supply system using a roof drain pipe according to the present invention collects rain water and uses it as drain water for flushing toilets of flush toilets. In the water supply system
A rainwater storage tank provided on the roof and an underground underground water tank provided underground are connected by a middle water pipe that also serves as a roof drain pipe, and the first pressure pump and the first check valve are provided on the rainwater storage tank side of the middle water pipe. And a second pressure pump and a second check valve on the side of the underground water tank, respectively, and a middle water supply pipe connected to a flush toilet is provided between them, and the first water valve and the first valve are respectively connected to the middle water pipe. A rainwater inlet pipe for guiding the rainwater from the rainwater storage tank to the underground underground water tank through two valves and a drain pipe for discharging surplus or old intermediate water to the outside of the system are connected, and the third underground valve is connected to the underground valve. It is characterized in that a clean water introducing pipe for guiding clean water from the clean water pipe is connected via the.

[0006] Further, a middle water supply system using a roof drain pipe according to the present invention is the above-mentioned middle water supply system using a roof drain pipe, wherein the middle water pipe is provided with a pressure sensor for detecting water pressure in the pipe. The first water level sensor and the second water level sensor are installed in the rainwater storage tank and the underground water tank, respectively.
A water level sensor is provided, the first pressure pump and the second pressure pump are controlled by signals from these sensors, and a water supply pressure controller is provided for keeping the inside water pipe in a pressurized and full state at the same time. , Second valve, third valve, first
A water retention controller for controlling the pressure pump and the second pressure pump to adjust the water retention in the rainwater storage tank and the underground water tank is provided.

[0007]

According to the medium water supply system using the roof drain pipe of the present invention, the drainage water and the medium water can be supplied by the medium water pipe which also serves as the roof drain pipe.
By properly operating the pressure feed pump and the second pressure feed pump, the inside of the middle water pipe can be constantly kept under pressure and full water can be supplied to the flush toilet as flush water. Furthermore, by stopping the first pressure pump, rainwater can be temporarily stored in the rainwater storage tank on the roof, so the rainwater can be used to the maximum extent, and the rainwater from this rainwater storage tank is transferred to the underground water tank via the rainwater introduction pipe. It is possible to secure the intermediate water by introducing it and storing it, discharging excess or old intermediate water to the outside of the system through the drainage pipe, or when the amount of intermediate water decreases. There is. It also helps reduce the sewer load.

Further, according to the medium water supply system using the roof drain pipe of the present invention, the pressure in the medium water pipe, the water level in the rainwater storage tank and the underground medium water tank are respectively measured by the pressure sensor, the first water level sensor and the second water level sensor. It is possible to appropriately control the first valve, the second valve, the third valve, the first pressure feed pump, and the second pressure feed pump, which are detected by the water level sensor, and based on the detection signals, the water supply pressure controller and the water retention amount controller. Therefore, it is possible to optimally control the intermediate water supply system so that the system efficiency is maximized while making maximum use of the rainwater and adjusting the water retention amount in the rainwater storage tank and the underground intermediate water tank.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to FIG. FIG. 1 is a configuration diagram of a gray water supply system using a roof drain pipe according to the present invention. In the basement of the building 1, a water receiving tank 3 that receives the supply of clean water from the water supply pipe 2 is installed,
From the same receiving tank 3, tap water pump 4, check valve 5, tap water pipe 6
The tap water is supplied to the water supply point 7 in the building 1 via the.

On the other hand, on the roof of the building 1, a rainwater storage tank 8 for collecting rainwater and storing the rainwater is installed, and in the basement of the building 1, an underground water tank 9 for storing gray water is installed. Has been done. Generally, the roof drain is gravity drainage, and usually one building has two or more roof drain pipes. This roof drain pipe is intended to be used as the medium water pipe 10. Therefore, a stainless steel pipe, a polyethylene powder lined steel pipe having a smaller diameter than a normal roof drain pipe, capable of withstanding general water supply pressure, and free from corrosion. , PVC pipe, polyethylene pipe, etc. are used.

A middle water pipe 10 which also serves as a roof drain pipe is arranged between a rainwater storage tank 8 and an underground water tank 9, and in the middle of the middle water pipe 10, a first pressure pump 11 and a first pressure pump 11 are provided on the rainwater storage tank 8 side. A check valve 12 is provided, a second pressure pump 13 and a second check valve 14 are provided on the side of the underground water tank 9, and a middle water supply pipe 16 connected to a flush toilet 15 is provided between them. Further, a pressure sensor 17 for detecting the pressure inside the water pipe 10 is provided in the middle water pipe 10, and the water supply pressure controller 1
First pressure feed pump 11 and second pressure feed pump 13 via 8
The inside of the middle water pipe 10 is always kept under pressure and full by controlling the
In contrast, medium water can be supplied as washing water.

Further, in the intermediate water pipe 10, the rainwater introduction pipe 1 for guiding the rainwater from the rainwater storage tank 8 on the roof to the underground underground water tank 9.
9 is connected via the first valve 20, and a drain pipe 2 for discharging excess or old intermediate water out of the system.
1 is connected via the second valve 22, and in the underground water tank 9,
A clean water introducing pipe 24 that guides clean water from the clean water pipe 6 via the third valve 23 is connected. The clean water introducing pipe 24 is arranged so that its water outlet does not touch the water surface of the underground water tank 9.

The rainwater storage tank 8 and the underground water tank 9 are provided with a first water level sensor 25 and a second water level sensor 26 using electrode rods, respectively.
The first valve 20, the second valve 22, and the third valve 2 according to the signal from 6.
3, a water retention controller 27 that controls the first pressure pump 11 and the second pressure pump 13 to adjust the water retention in the rainwater storage tank 8 and the underground water tank 9 is provided.

According to the above-described embodiment, when rainwater is stored in the rainwater storage tank 8 on the roof during rain, or when the rainwater storage tank 8 is used.
When there is no stored water, the first pressure pump 11 is stopped and the second pressure pump 13 is operated with the first valve 20 and the second valve 22 closed, so that the underground water tank 9 can be used to remove the medium water pipe 1.
0 to supply the tap water to 0 to keep the inside of the tap water pipe 10 constantly filled with pressure, and to feed the tap water to the flush toilet 15 via the tap water supply pipe 16 to use it as toilet wash water. You can

When there is stored water in the rainwater storage tank 8, the second pressure pump 13 is stopped and the first valve 20 and the second
By operating the first pressure pump 11 with the valve 22 closed, the stored water in the rainwater storage tank 8 is supplied to the intermediate water pipe 10 to keep the inside of the intermediate water pipe 10 in a pressurized full state. By supplying water to the flush toilet 15 through the clean water supply pipe 16 as water, it can be used as toilet flush water. The pressure inside the middle water pipe 10 is measured by the pressure sensor 1.
7 and controls the first pressure feed pump 11 and the second pressure feed pump 13 via the feed water pressure controller 18, so that the inside of the medium water pipe 10 is always kept in a pressurized full state.

On the other hand, the capacity of the underground underground water tank 9 is equivalent to the sum of the rainwater temporary storage tank and the intermediate water tank under administrative guidance, and when the rainwater storage tank 8 on the roof has a sufficient capacity, The capacity can be obtained by subtracting the amount, but an optimum value exists depending on the amount of collected water and the load of medium water, so that the capacity is determined to be an appropriate value between the above. Here, if there is stored water in the rainwater storage tank 8 on the roof and the underground water tank 9 is full,
By operating the pressure pump 13 and opening the second valve 22, the old medium water is discharged to the outside of the system through the drainage pipe 21, and the second valve 22 is closed when the underground water tank 9 is not full. , The first valve 20 is opened and the first pressure pump 11 is operated, whereby the stored water in the rainwater storage tank 8 is returned to the middle water pipe 10,
It can be led to the underground underground water tank 9 through the rainwater introduction pipe 19 and stored therein.

The amount of water retained in the rainwater storage tank 8 and the underground water tank 9 is adjusted by the first water level sensor 25 and the second water level sensor 26 provided in the rainwater storage tank 8 and the underground water tank 9. 8 and the water level in the underground water tank 9 are detected,
First valve 20, second valve 22, first pressure pump 11 and second
When the amount of stored water in the rainwater storage tank 8 and the underground water tank 9 is less than the set amount, which is adjusted by controlling the pressure pump 13, the third valve 23 in the clean water introduction pipe 24 is opened. By introducing the clean water from the clean water pipe 6 to the underground water tank 9, it is possible to always secure the stored water of a set amount or more.

As described above, the drainage pipe 10 is also used as a roof drain pipe so that rainwater can be drained and drained, and a pipe having a diameter smaller than that of the conventionally commonly used roof drain pipe can be used. It is possible to reduce the cost and the cost required for piping of the middle water pipe. In addition, the first pressure pump 11
It is possible to temporarily store rainwater on the rooftop by controlling the above, so you can eliminate the temporary storage tank and reduce the cost of the tank, or improve the rainwater utilization rate by using the temporary storage tank as a rainwater tank. Can be achieved. Although a method of temporarily storing rainwater on the roof has existed in the past, the idea is fundamentally different from the present invention intended to optimally use the stored water as medium water.

Further, since the feed water pressure controller 18 and the water holding amount controller 27 are designed to optimally control the gray water supply system so that the rain water can be utilized to the maximum extent, the system efficiency can be improved. In addition, when the system of the present invention and the rainfall prediction system are linked, if rainfall is expected, it is judged from the catchment area and the expected amount of rainfall, and the stored rainwater is discharged in advance to store new rainwater. It is also possible to do so.

[0020]

As described above, according to the intermediate water supply system using the roof drain pipe of the present invention, the intermediate water pipe is also used as the roof drain pipe, so that the cost required for the piping space and the intermediate water pipe can be reduced. It can be reduced. Moreover, since rainwater can be temporarily stored in the rainwater storage tank provided on the rooftop, it is possible to maximize the use of rainwater and improve its utilization rate. Further, by providing the water supply pressure controller and the water retention amount controller, the gray water supply system can be optimally controlled, so that the efficiency of the system can be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a gray water supply system using a roof drain pipe according to an embodiment of the present invention.

[Explanation of symbols]

 6 Water pipe 8 Rainwater storage tank 9 Underground water tank 10 Medium water pipe 11 First pressure pump 12 First check valve 13 Second pressure pump 14 Second check valve 15 Flush toilet 16 Middle water supply pipe 17 Pressure sensor 18 Water supply pressure Controller 19 Rainwater introduction pipe 20 First valve 21 Drain pipe 22 Second valve 23 Third valve 24 Clean water introduction pipe 25 First water level sensor 26 Second water level sensor 27 Water retention controller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Taishi Oseto 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd.

Claims (2)

[Claims] 1. A midwater supply system that collects rainwater and uses it as wash water in a flush toilet between a rainwater storage tank provided on a roof and an underground water tank provided underground. A drainage pipe that also serves as a roof drain pipe, and a first pressure pump and a first check valve on the side of the rainwater storage tank of the drainage pipe, and a second pressure pump and a second check on the side of the underground water tank. A valve is provided respectively, and a middle water supply pipe connected to the flush toilet is provided between the valves, and rainwater introduction is provided for guiding the rainwater from the rainwater storage tank to the underground water tank through the first water valve and the second valve, respectively. It is characterized in that a pipe and a drain pipe for discharging excess or old middle water to the outside of the system are connected, and further a water supply introducing pipe for guiding water from the water supply pipe through a third valve is connected to the underground water tank. Water supply system using roof drain pipe . 2. A pressure sensor for detecting water pressure in the pipe is provided in the middle water pipe, and a first water level sensor and a second water level sensor are provided in the rainwater storage tank and the groundwater tank, respectively.
A supply water pressure controller for controlling the first pressure pump and the second pressure pump by signals from these sensors to keep the inside water pipe in a pressurized and full state at all times,
The first valve, the second valve, the third valve, the first pressure pump and the second
The medium water supply system using a roof drain pipe according to claim 1, further comprising a water retention controller for controlling a pressure pump to adjust a water retention amount in the rainwater storage tank and the underground water tank.