JPH05321306A - Dead water preventing piping system - Google Patents

Abstract

(57) [Summary] [Purpose] Even if water is not used for a long period of time, prevent dead water from occurring in the water supply pipe and eliminate hygiene problems due to deterioration of water quality. [Structure] A return pipe 7 is connected to an end of the water supply pipe 3, and the return pipe 7 is connected to the water supply tank 1. A transfer means 13 for transferring the water in the pipe to the water supply tank 1 is attached to the return pipe 7, and further, a chlorine injection device 19 for introducing chlorine into the pipe by the detection signals from the detection means 9a and 9b is attached to the return pipe 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dead water prevention piping system in which a fluid in a pipe does not stay.

[0002]

2. Description of the Related Art Conventionally, a water supply system in a building has been unidirectionally piped through a plurality of supply destinations. For example, in a building where a high water tank is installed, a water supply pipe is connected to this high water tank,
The water supply pipe is unidirectionally piped through multiple water supply destinations in the building. At each water supply destination where the water supply pipe is installed, a water tap is attached to the water supply pipe to take out water from the water supply pipe. Therefore, the tip of the water supply pipe is generally closed. In the water supply system that is piped in this way, when the water pressure from the elevated water tank is evenly applied to the water supply pipe and the faucet is opened, the water in the pipe is discharged from the opened faucet to the faucet. The water in the pipe will flow. Since the conventional water supply system is unidirectionally piped, it is economical in terms of the space occupied by the pipes and the construction of the pipes.

[0003]

However, since the conventional water supply system is unidirectionally piped and the tip is closed, when the water is not used for a long period of time such as when the building is closed, Since the water did not flow and became dead water, there was a risk that the water quality would deteriorate and impair sanitation. On the other hand, in the past, as a measure to prevent such a situation, there was a method of attaching a valve to the tip of the water supply pipe and discharging the water in the water supply pipe on the day before the closed day so that dead water does not occur. In addition to the time and effort required to thoroughly implement it, there was the inconvenience of not being able to use water at all as well as wasting water resources.

The present invention has been made in view of the above circumstances, and even when water is not used for a long period of time,
The purpose of the present invention is to provide a dead water prevention piping system that does not cause dead water, and to prevent a sanitary obstacle caused by deterioration of water quality.

[0005]

The structure of a dead water prevention piping system according to the present invention for achieving the above object is a water supply tank, a water supply pipe connected to the water supply tank and connected to a water supply place, and a water supply pipe. Connected to the end of the water supply pipe and the end of which is connected to the water supply tank and has an inner diameter smaller than that of the water supply pipe, a transfer means which is attached to the return pipe and transfers the water in the water supply pipe and the return pipe to the water supply tank, and is attached to the return pipe And a chlorine injection device that is attached to the return pipe and that receives a detection signal from the detection device and that injects a predetermined amount of chlorine into the return pipe when a predetermined detection signal value is received. It is characterized by that.

[0006]

In the state where water is not used, the water in the water supply pipe is circulated little by little through the return pipe to the water supply tank by the transfer means, so that the water is always in a fluidized state and does not stay. When the water quality abnormality is detected by the detecting means, chlorine is injected into the circulating water by the chlorine injection device, the water quality in the circulating water is improved, and the water quality is not deteriorated even when the water is not used for a long period of time.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the dead water prevention piping system according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is an explanatory view of a dead water prevention piping system according to the present invention. A water supply pipe (outgoing pipe) 3 is connected to the elevated water tank 1 which is a water supply tank installed in a high place of a building, and a water tap 5 is attached to the outward pipe 3. A return pipe 7 is connected to the end of the outward pipe 3 (the side farther from the elevated water tank 1), and the inner diameter of the return pipe 7 is smaller than that of the outward pipe 3, and a small amount of water flows. The return pipe 7
It is piped in the direction of the elevated water tank 1 along the outward pipe 3, and the tip is opened in the elevated water tank 1 at a position higher than the water level surface of the elevated water tank 1. The return pipe 7 near the connecting portion with the outgoing pipe 3 and the return pipe 7 near the elevated water tank 1 are provided with sensors 9a, 9 as detecting means.
b is attached, and the sensors 9a and 9b can detect the water quality in the return pipe 7.

As a water quality sensing method of the sensors 9a and 9b, for example, there is a method of detecting residual chlorine concentration and judging dead water based on the detected value. The residual chlorine concentration in this case is based on whether or not a residual chlorine concentration of 0.1 mg / l or more is secured. In addition, as another water quality sensing method, the dead oxygen may be determined by detecting the dissolved oxygen concentration with the sensors 9a and 9b. In this case, the dissolved oxygen concentration is set to a normal value of 5 to 8 mg / l, and
An abnormal value is 4 mg / l. In this way, the normality of the water quality (whether the water is dead water or not) is judged at a plurality of places in the return pipe 7.

Return pipe 7 between the sensor 9b and the elevated water tank 1
An orifice 11 is attached to the. A return pump 13 as a transfer means is attached to the return pipe 7 between the orifice 11 and the elevated water tank 1, and the return pump 13 transfers the water in the return pipe 7 into the elevated water tank 1. There is. The return pump 13 always operates to circulate the water in the outflow pipe 3 and the return pipe 7 at all times, and may perform a scheduled operation by using a timer or the like so that the water in the pipe does not stay for a long time. A chlorine injection pipe 15 is connected to the return pipe 7 between the return pump 13 and the elevated water tank 1, and the chlorine injection pipe 15
Is connected to a chlorine injection device 19 via a check valve 17. The water quality detection values from the sensors 9a and 9b are input to the chlorine injection device 19, and when the water quality detection value becomes an abnormal value (dead water), the chlorine injection device 19 is located in the return pipe 7. It is designed to supply a certain amount of chlorine.
The chlorine injection device 19 includes a return pipe 7 near the connecting portion with the forward pipe 3, that is, a return pipe 7 near the sensor 9a (a in FIG. 1).
Part).

In the dead water prevention piping system configured as described above, if the water is not used when the building is closed, etc., the water is not discharged from the faucet 5, but the return pump 13 is operated, and The water in 3 is circulated little by little through the return pipe 7 to the elevated water tank 1, and the water in the pipe is always in a fluidized state and does not stay. Furthermore, the sensor 9a,
When abnormal water quality is detected by 9b, chlorine injection device 1
By adding chlorine to the circulating water according to 9, the water quality in the circulating water is improved, and even if the water is not used for a long period of time, the water quality is not deteriorated.

In the above-mentioned embodiment, the case where the elevated water tank 1 is installed in a high place of the building has been described as an example, but conversely,
The dead water prevention piping system according to the present invention can also be adopted in a water supply system in which a water receiving tank is installed in a low place. FIG. 2 is an explanatory diagram when the dead water prevention piping system according to the present invention is used in a water supply system of a pressure feeding system. The same members as those shown in FIG. 1 are designated by the same reference numerals, and duplicated description will be omitted. A water supply pipe (outgoing pipe) 3 is connected to a water receiving tank 21 which is a water supply tank installed in a low place of the building, and the outward water pipe 3 is provided with a water supply pump unit 23 and a pressure tank 25. A return pipe 7 is connected to the end portion of the outward pipe 3 and
A sensor 9a is attached to the return pipe 7 in the vicinity of the connection portion with. The return pipe 7 is piped in the direction of the water receiving tank 21 along the outward pipe 3 and has an end opened in the water receiving tank 21 at a position higher than the water level surface of the water receiving tank 21.

An orifice 11 is attached to the return pipe 7 in the vicinity of the water receiving tank 21, and an electromagnetic valve 27 as a transfer means is attached to the return pipe 7 between the orifice 11 and the water receiving tank 21. The solenoid valve 27 may be normally opened to return the water in the return pipe 7 to the water receiving tank 21 side at all times, or may be operated by a schedule using a timer or the like so that the water in the pipe does not stay for a long time. The chlorine injection pipe 15 is connected to the return pipe 7 between the electromagnetic valve 27 and the water receiving tank 21, and the chlorine injection pipe 15 is connected to the chlorine injection device 19 via the check valve 17.
Therefore, when the water quality detection value from the sensor 9a becomes an abnormal value, the chlorine injection device 19 injects a predetermined amount of chlorine into the return pipe 7 as described above.

As described above, even in the water supply system in which the water receiving tank 21 is installed at a low place, by opening and closing the solenoid valve 27,
The water in the outflow pipe 3 is circulated little by little through the return pipe 7 to the water receiving tank 21, and is always in a fluidized state.
The water in the pipe will not accumulate. Also, when the sensor 9a detects an abnormality in the water quality, the chlorine injection device 1 is also operated as described above.
Chlorine was added by 9 to improve the water quality in the circulating water,
It is possible to prevent the deterioration of water quality.

[0014]

As described in detail above, the dead water prevention piping system according to the present invention connects the return pipe to the water supply pipe,
This return pipe was equipped with a transfer means for transferring the water in the pipe to the water supply tank, and was further equipped with a chlorine injecting device for injecting chlorine into the pipe in response to the detection signal from the detection means. , The water in the water supply pipe is circulated little by little to the water supply tank, and is always in a flowing state so that dead water is not generated. Further, when the detecting means detects an abnormality in the water quality, chlorine is injected into the circulating water from the chlorine injecting device to improve the water quality in the circulating water, so that the deterioration of the water quality can be reliably prevented. As a result, it is possible to significantly improve the water quality when the supply water is not used, and it is possible to eliminate a problem in hygiene.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a dead water prevention piping system according to the present invention.

FIG. 2 is an explanatory diagram when the dead water prevention piping system according to the present invention is used in a pressure feed water supply system.

[Explanation of symbols]

 1 High-place water tank (water supply tank) 3 Outgoing pipe (water supply pipe) 7 Return pipe 9a, 9b Sensor (detection means) 13 Return pump (transfer means) 19 Chlorine injection device 21 Water receiving tank (water supply tank) 27 Solenoid valve (transfer means) )

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kazuhiro Hiranuma Kazuhiro Hiranuma 1-2-7 Moto Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Mitsuaki Kashiwayani 3-4-7 Nishi-Shinjuku, Shinjuku-ku, Tokyo No. Kurita Industry Co., Ltd.

Claims (1)

[Claims] 1. A water supply tank, a water supply pipe connected to the water supply tank and piped to a water supply place, connected to an end of the water supply pipe, and having an end connected to the water supply tank and having an inner diameter larger than that of the water supply pipe. A small return pipe, a transfer unit attached to the return pipe for transferring the water supply pipe and water in the return pipe to the water supply tank, a detection unit attached to the return pipe for detecting water quality in the pipe, and the return pipe A dead water prevention piping system, comprising: a chlorine injecting device attached to the device and supplying a predetermined amount of chlorine into the return pipe when receiving a detection signal from the detecting means and receiving a predetermined detection signal value.