JP3308211B2 - Rainwater flow switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rainwater flow switching device, and more particularly to a device structure suitable for a rainwater collecting system connected to a rainwater storage tank for collecting and storing rainwater.

[0002]

2. Description of the Related Art Conventionally, rainwater has been widely collected and stored in a storage tank and used as emergency water or as water for toilets and irrigation. Normally, rainwater falling on the roof of a house is collected in a storage tank by connecting a rain gutter to the storage tank. In some areas, many such rainwater collection systems are installed to save tap water and prevent flood damage. If such a system is configured to be able to operate without energy consumption, it is possible to use water without causing environmental destruction, which is very effective in modern society.

[0003] The rainwater collecting system is designed to prevent the introduction of water having a high acidity in the early stage of rainfall or water containing a large amount of dust or dust accumulated on a roof or a gutter into a storage tank. In some cases, a rainwater flow path control device that is automatically switched using a rainwater flow path, or electrically using a sensor or the like, or mechanically using a float or the like is mounted. These devices include simple devices for manually switching valves as described in JP-B-56-24750 and JP-A-56-556.
No. 42, Japanese Patent Publication No. 4-10538, in which a flow path is automatically switched using a float valve.
Japanese Patent Laying-Open No. 10-37255 discloses a configuration in which the flow path is automatically switched according to the weight of rainwater, and Japanese Patent Publication No. 59-14538 and Japanese Utility Model Publication No. 3-30442 disclose a throttle in the flow path. In some cases, only clean rainwater is naturally introduced into the storage tank by overflow.

[0004]

However, in the above-mentioned conventional rainwater collecting system, rainwater mixed with a large amount of dust is removed in the early stage of rainfall, and after a certain period of time, the rainwater is accumulated in the storage tank. Therefore, there is a problem that it is not always possible to properly collect water depending on rainfall conditions. For example, in the case of heavy rainfall, the amount of acid substances and dust mixed in rainwater decreases in a short time, but when a small amount of rainfall occurs continuously, the amount of acid substances and rainwater in rainwater decreases. The amount of dust mixed in may not be reduced. In a conventional rainwater collection system, a certain amount of rainwater accumulates by a method using a float or a method of providing a throttle,
In addition, the introduction of rainwater into the storage tank is not started unless the amount of rainfall exceeds a certain level, but it is not possible to more appropriately control the start time of the introduction of rainwater into the storage tank according to the rainfall situation. For example, in the prior art provided with the above-described constricted portion, the rainwater is gradually discharged from the rainwater receiving portion so that the point of introduction of the rainwater into the storage tank is slightly shifted according to the magnitude of the rainfall. Until then, it is impossible to change the preset operation characteristics such as the required rainfall.

In the case of a conventional rainwater collecting system,
To speed up or delay the start of rainwater introduction depending on local conditions (for example, the amount of dust) or house conditions (for example, roof area), it is necessary to change the pipe size, pipe shape and structure itself. For this reason, there is a problem that it is not possible to easily perform adjustment according to the situation, and it lacks responsiveness to the situation of the installation location.

Further, the most problematic problem in collecting rainwater is dust mixed with the rainwater (especially large ones such as twigs and stones also flow). The system itself stops working,
There is a problem that the flow path switching mechanism does not operate. The above-mentioned various conventional systems do not always have sufficient countermeasures against the clogging, and it is very difficult to operate them for a long time without maintenance.

SUMMARY OF THE INVENTION Accordingly, the present invention is to solve the above-mentioned problems, and its object is to collect rainwater accurately according to the rainfall conditions and to adjust the water collecting function according to the situation of the installation place. It is an object of the present invention to provide a rainwater collecting technique which can easily perform the above-mentioned operation, and is less likely to cause clogging and can reduce maintenance.

[0008]

Means taken by the present invention to solve the above-mentioned problems is to provide a rainwater discharge device having an opening between a rainwater inflow portion and a rainwater collecting portion for taking in rainwater. The bypass path is provided, receives at least a part of the rainwater flowing into the bypass path, and discharges the rainwater little by little, and furthermore, a movable rainwater receiving member is arranged in the bypass path, and the rainwater receiving member is provided. Inflow control means for controlling inflow of rainwater into the bypass path in conjunction therewith is provided, and the inflow control means reduces or shuts off inflow of rainwater into the bypass path by increasing the amount of water in the rainwater receiving member. It is a flow path switching device for rainwater characterized by having such a configuration.

According to this means, rainwater flows into the bypass path because the opening of the bypass path is provided between the inflow section and the water collecting section, but a rainwater receiving member is disposed in the bypass path. When water flows into the rainwater receiving member and the amount of water in the rainwater receiving member increases, the inflow control means operates to operate to reduce or shut off the inflow of rainwater into the bypass path. Rainwater that is not discharged to the channel is introduced into the rainwater tank from the catchment section.
Since the rainwater receiving member has a drain port, the rainwater is discharged little by little, and when the amount of water inside the rainwater receiving member decreases, the rainwater flows into the bypass path again by the flow control means linked to the rainwater receiving member, so The drainage from the bypass path is restarted by the control means, and the drainage to the bypass path is reduced or cut off when water is accumulated in the rainwater receiving member again due to the inflow of rainwater into the bypass path. Is repeatedly performed, or the amount of rainwater in the rainwater receiving member and the amount of rainwater flowing into the bypass path by the flow control means are balanced, and a steady state is reached. Therefore, if the inflow of rainwater increases, rainwater can be quickly supplied to the catchment section. However, if the inflow of rainwater is small, the supply of rainwater to the collection section is not performed, or the bypass is initially bypassed for a while. Since the supply of rainwater to the water collecting portion can be started after discharging the rainwater to the path, water having high acidity and water containing a large amount of dust at the beginning of rainfall can be appropriately removed. In addition, since the supply of rainwater to the water collection section is controlled by the rainwater receiving member movably accommodated in the bypass path and the inflow control means interlocked with the rainwater receiving member, the rainwater can be received without changing the piping shape or structure. Since the control characteristics can be adjusted and changed by adjusting and changing the receiving member and the inflow control means, it is possible to flexibly respond to the situation of the installation location and the like. Furthermore, drainage from the bypass route is performed even during rainwater intake,
Since the rainwater receiving member can always be moved and the opening / closing member can be set to be repeatedly operated, it is possible to prevent the bypass path from being clogged with dust.

[0010] In claim 1, the inflow control means includes:
A flow port provided in the bypass path, and an opening / closing member that can approach and separate from the flow port, is provided with the opening / closing member connected to the rainwater receiving member and with respect to the bypass path via an elastic member. The opening / closing member is supported by the weight of the water in the rainwater receiving member, against the elastic force of the elastic member, so as to reduce the substantial flow cross-sectional area of the flow opening or close the flow opening. It is preferable that it is comprised. According to this means, the opening / closing member is supported by the flow path via the elastic member, and the opening / closing member is connected to the rainwater receiving member. When the weight increases due to the inflow of water into the rainwater receiving member, the opening / closing member becomes the elastic member. Since the flow opening is narrowed or closed against the elastic force, the inflow control means can be operated with a simple structure according to the amount of water in the rainwater receiving member.

Preferably, the rainwater receiving member is suspended and supported by the opening / closing member in the bypass path. According to this means, since the rainwater receiving member is suspended and supported by the opening / closing member, the weight change of the rainwater receiving member can be more reliably transmitted to the opening / closing member, and the opening / closing member can be operated with a simple structure.

[0012] In the third aspect, a drain port for discharging rainwater is provided at a lower end of the rainwater receiving member, and the rainwater receiving member is movable with respect to the drain port in a state where the drain port can be drained. It is desirable that an insertion member be inserted in the direction and fixed to the bypass path, and the lower end portion of the rainwater receiving member be supported by the insertion member. According to this means, the lower part of the rainwater receiving member can be supported by the insertion member by inserting the insertion member into the drain port formed at the lower end of the rainwater receiving member, and at the same time, the rainwater receiving member is When the insertion member moves, the insertion member moves relative to the drain port, so that the insertion member in the insertion / removal direction can prevent the drain port from being clogged by dust or the like.

3. The rainwater receiving member according to claim 1, wherein the rainwater receiving member has a drain port for discharging rainwater, and the rainwater receiving member is movable with respect to the drain port in a state where the drain port can be drained in the bypass path. It is preferable that an insertion member inserted in the direction is provided.

[0014] In the first aspect of the present invention, it is preferable that the water collecting section is formed by a water collecting pipe extending from the inflow section and opening to the rainwater tank at a position higher than an opening of the bypass path. In this way, the rainwater can be reliably guided to the rainwater tank only when the discharge of the rainwater to the bypass path is smaller than the inflow amount.

In the first aspect, it is preferable that a drain pipe is connected to the inflow section at a position higher than a connection section of the water collecting pipe. In claim 6, when a drain pipe is connected to the inflow part, an opening of the water collection pipe with respect to the rainwater tank is formed slightly below a connection part of the drain pipe in the inflow part. Is preferred. In claim 1, it is preferable that the inflow portion is provided with a dust filter upstream of a connection position of the water collecting pipe. In this case, it is effective that the inflow portion extends below the connection position of the water collecting portion,
At this time, it is effective that the dustproof filter also extends inside the inflow portion below the connection position of the water collecting portion. In addition, it is effective that the dustproof filter is provided with a space around the connection position of the water collecting portion and at the same time with the inner surface of the inflow portion. In claim 1, when a drain pipe is connected to the inflow part, it is preferable that the bypass path joins a downstream part of the drain pipe. In claim 2, it is preferable that the opening / closing member and the rainwater receiving member are connected by a flexible member. Further, it is preferable that a filter is attached to the rainwater receiving port of the rainwater receiving member. Each of the above-mentioned means is particularly effective when used as a part of a rainwater collecting system constituted by connecting the water collecting section to a rainwater tank.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a rain water flow path switching device according to the present invention and a rain water collecting system using the same will be described with reference to the accompanying drawings. FIG. 1 is a schematic enlarged sectional view showing a schematic structure of a rainwater flow path switching device. The flow path switching device 10 includes a tubular inflow pipe 11 and a water collection pipe 12 having an opening 12 a in a side wall of the inflow pipe 11.
And a bypass pipe 13 having an opening 13 a in a lower wall surface in the middle of the water collecting pipe 12, and a drain pipe 14 having an opening 14 a for the inflow pipe 11 above the opening 12 a of the water collecting pipe 12.

The inflow pipe 11 has an opening 11a at its upper end, and the opening 11a is connected to a rain gutter of a house. The inflow pipe 11 extends below the opening 12 a of the water collecting pipe 12 and has an opening 11 b at the lower end thereof. The opening 11 b is sealed by a cap 15. A substantially cylindrical filter 11c having edges protruding outward at upper and lower ends is accommodated in a lower portion of the inflow pipe 11, and the filter 11c is disposed inside the cap 15 below the opening 11b from above the opening 12a. Has grown to The filter 11c is accommodated concentrically with the inner wall of the inflow pipe 11 so as to have a slight space over the entire circumference, and the rainwater flowing in through the opening 11a passes through the filter 11c and is opened. Water collection pipe 1 from 12a
2.

The water collecting pipe 12 extends substantially horizontally from the opening 12a, is introduced into a rainwater tank 20, which is a storage tank, and has an opening 12b that is bent upward and directed upward in the rainwater tank 20. In the present embodiment,
The vicinity of the opening 12b in the water collecting pipe 12 corresponds to the water collecting part described above. An opening 13a of a bypass pipe 13 is provided below the side wall of the water collecting pipe 12, and the bypass pipe 13 extends substantially vertically downward from the opening 13a. A rainwater receiving pipe 16 having a substantially vertical posture is accommodated inside the bypass pipe 13, and the rainwater receiving pipe 16 is connected to a spherical opening / closing member 17 by a strip 26 such as a wire or a string. Elastic member 18 such as a coil spring whose upper end is fixed near
Is connected to the lower end. For this reason, the rainwater receiving pipe 16
It is in a state of being suspended inside the bypass pipe 13 by the strip member 26, the opening / closing member 17 and the elastic member 18.

Below the opening / closing member 17, there is provided an upper flow opening 13b integrally formed inside the bypass pipe 13. When the opening / closing member 17 is pressed against the upper flow opening 13b from above, the rain water in the bypass pipe 13 is removed. Distribution is cut off. The upper end of the rainwater receiving pipe 16 is provided with an upper opening 16a having a shape obtained by diagonally cutting the end of the pipe material,
The lower end of the strip 26 is fixed inside the upper opening 16a. A mesh plate 16c having a function as a dust filter is attached to the upper opening 16a. A drain port 16b having a diameter considerably smaller than that of the upper opening 16a is formed at a lower end portion of the rainwater receiving pipe 16, and the drain port 16b is connected to a support frame 13c fixed to a lower portion of the bypass pipe 13. A shaft member 19 fixed substantially vertically is inserted into the inside of the bypass pipe 13. The outer diameter of the shaft member 19 is formed to be smaller than the inner diameter of the drainage port 16b to some extent, so that rainwater flows down from the periphery of the shaft member 19 though slightly.

The drain pipe 14 has an opening 14 for the inflow pipe 11.
a, which extends downward from a and is connected to sewage and drains. The opening 14a is formed above the accommodation portion of the filter 11c, and the inside of the rainwater tank 20 becomes full and the water collecting pipe 12
When rainwater does not flow, rainwater that does not pass through the filter 11c overflows and is discharged into the drain pipe 14. The downstream part of the bypass pipe 13 is the drain pipe 1
4 is connected to the lower part. Rainwater tank 2 of water collection pipe 12
The lower end of the opening 14a of the drainpipe 14 is located above the length s with respect to the height of the opening 12b in 0. Although the rainwater tank 20 will be described later in detail, the lid 21 is mounted on the upper part to prevent dust and light from entering from outside.

Next, the function of the embodiment of the rainwater flow path switching device will be described. In this embodiment, when rainwater falls into the inflow pipe 11 from a rain gutter or the like, the rainwater accumulates in the lower portion of the inflow pipe 11, and when a certain amount is reached, the rainwater passes through the filter 11c and passes through the opening 12a. Rainwater flows into the collecting pipe 12. The rainwater that has entered the collecting pipe 12 enters the bypass pipe 13 through the opening 13a, and flows into the upper circulation port 13b.
And flows down in the bypass pipe 13. At this time, part of the rainwater that has passed through the upper circulation port 13b is
Enters the rainwater receiving pipe 16 from the inside. The rainwater that has entered the rainwater receiving pipe 16 is discharged from the drain port 16b at the lower end (from the gap between the drain port 16b and the shaft member 19). However, since the gap between the drain port 16 and the shaft member 19 is small, the amount of rainfall is small. If the amount is large, rainwater gradually accumulates in the rainwater receiving pipe 16.

When the rainwater accumulates in the rainwater receiving pipe 16, the weight of the rainwater receiving pipe 16 increases. Therefore, the opening / closing member 17 is pushed down against the elastic force of the elastic member 18, and the rainwater receiving pipe 1 is pushed down.
When the amount of water in 6 increases to a certain extent, opening / closing member 17 closes upper flow opening 13b. When the upper circulation port 13b is closed, the rainwater does not flow into the rainwater receiving pipe 16, so that when the rainwater is discharged little by little from the drain port 16b, the amount of water in the rainwater receiving pipe 16 gradually decreases and opens and closes again. The member 17 is raised by the elastic force of the elastic member 18, and the upper communication port 13b is opened. When the inflow of rainwater is larger than the amount of water flowing down the bypass pipe 13 in the state where the upper circulation port 13b is repeatedly opened and closed in this way, the water level in the water collection pipe 12 gradually rises, and eventually the rainwater flows from the opening 12b. Rainwater flows into the tank 20.

As described above, the maximum amount of drainage discharged through the bypass pipe 13 is limited. Therefore, when the inflow of rainwater exceeds this, the introduction of rainwater into the rainwater tank is started. When the inflow of rainwater is equal to or less than the maximum drainage of the bypass pipe 13, no inflow of rainwater from the water collection pipe 12 to the rainwater tank 20 occurs. In addition, even when there is a rainfall exceeding the maximum drainage, the time when the rainwater starts to be introduced into the rainwater tank from the start of the rain differs depending on the rainfall. When the amount of rainfall is small, the water level in the water collecting pipe 12 gradually rises, and the inflow of rainwater into the rainwater tank 20 is started in a long time, and the inflow of rainwater is also reduced.

FIGS. 2 and 3 show the entire configuration of a rainwater collecting system to which the rainwater flow path switching device of the above embodiment is applied. In this system, a rainwater tank 20 is connected to the flow path switching device 10. The rainwater tank 20 is formed in a cylindrical shape with a bottom, and a lid 21 shown in FIG. The rainwater tank 20 is installed in a state of being fixed on the gantry 22. As shown in FIG. 2, a water level gauge 23 is attached vertically along the side wall of the rainwater tank 20, and the inside of the water level gauge 23 communicates with the inside of the rainwater tank 20 at two places, an upper part and a lower part. I have. A water discharge valve 24 is provided at the lower end of the water level gauge 23.
Is attached.

The flow path switching device 10 is disposed along the side wall of the rainwater tank 20, and the water collection pipe 12 connected to the inflow pipe 11 extends horizontally, and after being bent at a substantially right angle on the way,
The rainwater tank 20 is introduced into the inside from the upper side wall. The bypass pipe 13 may be connected to any position of the water collecting pipe 12, but in this example, the bypass pipe 13 is connected between the connection part of the water collecting pipe 12 and the inflow pipe 11 to the bent portion, and is vertically vertically lowered as it is. It is growing. Drain pipe 1
4 is connected to the inflow pipe 11 and the inflow pipe 11 or the water collection pipe 1
2, and extends vertically downward between the bypass pipe 13 and the rainwater tank 20. By arranging the drain pipe 14 between the inflow pipe 11 or the water collecting pipe 12 and the bypass pipe 13 and the rainwater tank 20 in this manner, the flow path switching device 10
Are compacted, the total occupied volume can be reduced, the access to the inflow pipe 11 and the bypass pipe 13 is facilitated, and the maintainability is improved.

In the above embodiment, when the rainwater flowing into the inflow pipe 11 advances to the water collecting pipe 12, the water is drained from the bypass pipe 13.
There is an upper limit because the opening / closing member 17 is configured to open and close the upper circulation port 13b according to the weight of the water 6.
Rainwater flows into the rainwater tank from the river. At this time, water accumulates in the rainwater receiving pipe 16 from the beginning of rainfall, and the opening / closing member 17 starts closing the upper circulation port 13b, and further, it takes a certain time until rainwater flows into the rainwater tank 20 from the water collecting pipe 12. For this reason, the highly acidic water collected in the early stage of rainfall or the water containing much dust is discharged through the bypass pipe 13 and does not flow into the rainwater tank 20.

Also, from the start of the above-mentioned rainfall, the rainwater tank 20
The time required for rainwater to start flowing into the water or the amount of water discharged through the bypass pipe 13 decreases as the amount of rainfall per hour increases, so that the amount of rainfall increases, and the acidity of the rainwater is reduced in a short time, resulting in dust contamination. Even when the amount decreases, water can be collected efficiently. Conversely, the smaller the amount of rainfall per hour, the longer it takes for rainwater to flow into the rainwater tank 20 and the greater the amount of drained water. Even if time elapses, rainwater does not flow into the rainwater tank 20, and water having a strong acidity and a large amount of dust is discharged from the rainwater tank 20.
Do not enter. Further, when the amount of rainfall per unit time is equal to or less than the maximum drainage amount of the bypass pipe 13, the rainwater does not flow into the rainwater tank 20 from the opening 12 a of the water collecting pipe 12.

FIG. 4 is a graph showing the results of an experiment performed using the rainwater flow path switching device of the above embodiment. A water supply tank with a flow meter was connected to the inflow pipe 11, and the operation of the embodiment was confirmed while adjusting the water supply amount. Here, the inner diameter of the upper circulation port in the embodiment is 6.8 mm, and the inner diameter of the drain port 16b below the rainwater receiving pipe 16 is 6.2.
mm, the outer diameter of the shaft (round bar) inserted into the drain port 16b was 5.0 mm. Water was flowed from the water supply tank at a predetermined flow rate, and the amount of water flowing into the rainwater tank 20 (water intake) and the amount of water discharged from the lower part of the bypass pipe 13 (water discharge) were measured. In FIG. 4, the vertical axis indicates the amount of water taken per unit time (the amount of rainwater taken into the rainwater tank 20) and the drain pipe 1
4 shows the amount of wastewater (liter / minute) from the lower part, and the horizontal axis shows the amount of water flowing in per unit time (liter / minute).
Inflows 1, 2, 3, 4 (liters / minute) on the horizontal axis correspond to rainfall of 3, 6, 9, 12 mm / hour on a roof area of 20 m ² , respectively. The data shown in FIG.
It shows the steady water intake and drainage when the inflow is constant.

According to the above experiment, when the inflow rate is 0.75 liter / min or less, the water does not flow from the water collection pipe 12 to the rainwater tank 20. When the inflow rate becomes 1 liter / min, the water collection pipe is gradually increased. Water accumulates in the rainwater tank 20 and then begins to accumulate in the rainwater tank 20. The steady value of the water intake increases almost in proportion to the inflow when the inflow exceeds 1 liter / min. On the other hand, the steady value of the drainage rate gradually increases as the inflow rate increases to 1.5 l / min, and the inflow rate increases to 1.5 l / min.
After that, the drainage volume is saturated at about 0.75 liter / minute. In addition, even in the steady state, the amount of drainage is
7 changes periodically by repeating opening and closing.

Further, even when the inflow amount is constant as described above, the time from the start of inflow until the water intake amount and the drainage amount reach the steady-state value varies depending on the inflow amount. Time is shortened. Table 1 shows the relationship between the inflow rate (liter / minute) per unit time and the time from the start of inflow to the start of water intake (start of inflow of rainwater into the rainwater tank). Table 1 also shows the amount of waste water (liter) that is not taken into the rainwater tank and finally discarded from the start of inflow to the start of water intake.

[0031]

[Table 1] Inflow volume Time to reach steady state Wastewater volume 量 1.0 About 7 minutes About 7.0 1.5 2 minutes 50 seconds to 3 minutes 10 seconds About 4.5 2.0 About 2 minutes About 4.0 2.5 1 minute 10 seconds to 1 minute 20 seconds About 3.1 3 0.0 50 seconds to 1 minute Approx. 2.8 3.5 42 seconds to 48 seconds Approx. 2.6 ───────

As described above, since the amount of rainwater to be discarded before starting water intake increases as the amount of inflow per unit time, that is, the amount of rainfall decreases, it is necessary to take in rainwater containing high acidity or dust containing dust at the start of rainfall. Can be prevented.
If the rainfall is severe, the acidity and the amount of dust mixed in quickly decrease, but the amount of drainage until the start of water intake decreases, so that rainwater can be collected efficiently. In addition, in this embodiment, since the drainage through the bypass pipe is performed continuously even after the start of rainwater intake, clogging of the bypass pipe with dust can be suppressed.

The data shown in FIG. 4 and Table 1 are experimental data. As a device to be actually attached to a rain gutter of a house, a roof area, a length of a rain gutter, a pile on a roof or a rain gutter, etc. The minimum amount of inflow per hour that water can be withdrawn and the amount of wastewater until the start of water withdrawal are appropriately set in consideration of the amount of dust generated, the acidity change after the start of rainfall, and the like. These settings can be adjusted by the elasticity of the elastic member 18, the weight of the rainwater receiving pipe 16, the water inflow rate of the upper opening 16 a of the rainwater receiving pipe 16, the opening area of the upper circulation port 13 b and the discharge port 16 b, and the like.

The opening 12b in the rainwater tank 20 in the water collecting pipe 12 is connected to the opening 14b of the drain pipe 14 with respect to the inflow pipe 11.
Since it is located below the lowest position of a by s, water can normally flow from the water collecting pipe 12 to the rainwater tank 20 by the height difference s. When the water level in the rainwater tank 20 rises and becomes higher than the opening 12b of the water collecting pipe 12 by the height difference s, the drain pipe 1
The discharge of the rainwater into the rainwater tank 4 starts, and the water level in the rainwater tank 20 does not rise any more.

In the above embodiment, in particular, foreign matters such as dust, dust, dead leaves and the like mixed in rainwater are assumed, and consideration is made so that even if these dusts are mixed in rainwater, there is no problem. . The rainwater flowing into the inflow pipe 11 is
1, flows through the filter 11 c while convectionally flowing, and enters the water collecting pipe 12. Therefore, since rainwater is always convection inside the filter 11c, clogging of the filter 11c is unlikely to occur due to the stirring action, and furthermore, the filter 11c is entirely spaced from the inner peripheral surface of the inflow pipe 11. , The passage of rainwater is performed relatively uniformly throughout the filter 11c, and the clogging of the opening 12a of the water collecting pipe 12 is prevented from being extremely advanced. The lower end of the filter 11c is open, and the cap 15 screwed to the lower part of the inflow pipe 11 is provided.
Is removed, dust and the like inside the filter can be taken out as it is, and the filter 11c itself can be taken out easily for cleaning.

The rainwater receiving pipe 16 is suspended from the opening / closing member 17 via a strip 26. For this reason, the strip 26
Is composed of a flexible thin wire (thin wire, stainless wire, etc.), string (tex, octopus thread), etc.
The opening / closing member 17 descends due to the weight increase due to the inflow of the rainwater, and the opening / closing member 17 rises again due to the weight reduction due to the outflow of the rainwater from the drain port 16b due to the interruption of the rainwater inflow due to the lowering of the opening / closing member 17. In the repetitive operation, horizontal shaking occurs. The swinging of the rainwater receiving pipe 16 also swings the opening / closing member, thereby preventing clogging of dust or the like at the upper portion (such as the upper circulation port 13b) of the bypass pipe 13 and preventing the opening / closing member 17 from moving at a predetermined position. Is also prevented.

On the other hand, a drain port 16b below the rainwater receiving pipe 16
The shaft member 19 is inserted into the, and holds the plane position of the lower part of the rainwater receiving pipe 16. When the rainwater receiving pipe 16 moves up and down by the above-described repetitive operation, the opening edge of the drainage port 16b also moves up and down with respect to the shaft member 19, so that the movement of the shaft member 19 in the insertion and removal direction causes the drainage port 16b to move to the drainage port 16b. It is possible to prevent fine dust and the like from being clogged. Rainwater pipe 1
Since the mesh plate 16c is attached to the upper opening 16a of the sewage tube 6, large dust does not enter the inside of the rainwater receiving pipe 16, but fine dust enters and the drain port 1
This is because clogging may occur in 6b.

The upper opening 16a of the rainwater receiving pipe 16 is formed into a shape which is cut off obliquely at a predetermined inclination angle, and the mesh plate 16c is stretched here. This upper opening 16
The shape having the inclination angle of a is designed to guide a certain percentage of the rainwater flowing from the upper circulation port 13b into the rainwater receiving pipe 16. As the inclination angle is increased, the proportion of the amount of water flowing into the rainwater receiving pipe 16 can be reduced. Also, a rainwater receiving pipe 16 is arranged in the bypass pipe 13,
By arranging the upper opening 16a at a predetermined interval so as not to contact the inner peripheral surface of the bypass pipe 13, when the upper circulation port 13b is large, if the inflow of rainwater is small, the upper opening 16a is disposed on the inner peripheral surface of the bypass pipe 13. The amount of rainwater flowing into the rainwater receiving pipe 16 due to the rainwater flowing down along is extremely small,
It can be configured such that when the inflow of rainwater increases, the amount of water flowing into the rainwater receiving pipe 16 rapidly increases. Also,
As shown in FIG. 1, when the upper circulation port 13b has a shape narrowed to some extent, when rainwater passes through the upper circulation port 13b, it flows into the inside of the bypass pipe 13 in a conical water spray state. Therefore, water having a ratio substantially equal to the ratio of the opening area of the upper opening 16 a of the rainwater receiving pipe 16 to the internal sectional area of the bypass pipe 13 flows into the rainwater receiving pipe 16. In this case, when the inflow of rainwater is small,
It is also possible to increase the ratio of the amount of water flowing into the inside, and to decrease the ratio of the amount of water flowing into the rainwater receiving pipe 16 when the amount of rainwater flowing in increases.

In this embodiment, since the amount of drainage in the bypass pipe 16 is controlled by the operation of the rainwater receiving pipe 16, the rainwater receiving pipe 16 in the bypass pipe 13 is replaced by a method such as replacement of the rainwater receiving pipe 16. The main piping system (inflow pipe 1)
1. There is a remarkable effect that the switching control characteristics of the flow path can be adjusted and changed without changing the water collecting pipe 12, the bypass pipe 13, and the drain pipe 14). Conventional devices of this type all depend heavily on the shape of the pipe, and can only exhibit characteristics designed in advance. According to the present invention, it is possible to easily configure appropriate characteristics according to the situation of the installation location, and it is extremely easy to change the characteristics after installation.

In this embodiment, as long as a certain amount of rainfall continues during rainfall, the opening / closing member 17 is configured to supply rainwater to the rainwater tank 20 while repeating opening and closing. Upper distribution port 1 depending on the vertical position of
By configuring so that the substantial opening area of 3b increases or decreases, the amount of rainfall and the vertical position of the opening and closing member 17 are balanced, and when the rainfall becomes constant, the vertical position of the opening and closing member 17 converges at a predetermined position. Such a configuration is also possible.
In this case, the effect of preventing dust clogging due to the vertical movement of the rainwater receiving member is reduced, but since the drainage is continued, the clogging of the dust is not so much induced, and the other actions are almost the same as above. . Also in this case, in the case of the above embodiment, a receiving member made of synthetic rubber or the like is attached to the shaft member 19 at a predetermined height position, and the rainwater receiving pipe 16 is lowered below the desired position by this receiving member. It can also be configured not to. In this case, the rainwater receiving pipe 16 is supported by the receiving member, so that the opening / closing member 17 is connected to the upper communication port 13b.
And a large stress is applied between the opening / closing member 17 and the upper circulation port 13.

[0041]

As described above, when the inflow of rainwater is large, rainwater can be quickly supplied to the water collecting section. However, when the inflow of rainwater is small, the rainwater cannot be supplied to the water collecting section. It is not possible, or it is possible to start the supply of rainwater to the catchment part after draining rainwater to the bypass path for a while, so that water with high acidity and dust-rich water at the beginning of rainfall is appropriately Can be eliminated. In addition, since the supply of rainwater to the water collection section is controlled by the rainwater receiving member movably accommodated in the bypass path and the inflow control means interlocked with the rainwater receiving member, the rainwater can be received without changing the piping shape or structure. Since the control characteristics can be adjusted and changed by adjusting and changing the receiving member and the inflow control means, it is possible to flexibly respond to the situation of the installation location and the like. Furthermore, since drainage from the bypass path is performed even during rainwater intake, and the rainwater receiving member can be constantly moved and the opening / closing member can be repeatedly operated, it is possible to prevent clogging of dust in the bypass path. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic enlarged cross-sectional view showing a configuration of an embodiment of a rainwater flow switching device according to the present invention.

FIG. 2 is a plan view (a) and a front view (b) showing the entire configuration of a rainwater collection system configured using the above-described embodiment (with the lid of the rainwater tank removed).

FIG. 3A is a plan view showing a lid of the rainwater collecting system, and FIG. 3B is a side view of the collecting system.

FIG. 4 is a graph showing experimental data showing a relationship between steady-state values of the inflow amount of rainwater per unit time, the water intake amount and the wastewater amount per unit time, using the embodiment.

[Explanation of symbols]

 Reference Signs List 10 Rainwater flow switching device 11 Inflow pipe 11c Filter 12 Water collecting pipe 12a, 12b opening 13 Bypass pipe 13a opening 13b Upper circulation port 14 Drain pipe 16 Rainwater receiving pipe 16a Upper opening 16b Drain port 17 Opening / closing member 18 Elastic member 19 Shaft 20 rainwater tank 26 strips

Claims (6)

(57) [Claims] 1. A rainwater discharge bypass path having an opening provided between a rainwater inflow section and a rainwater intake section, and receives at least a part of rainwater flowing into the bypass path. And draining the rainwater little by little, furthermore, arranging a rainwater receiving member movably arranged in the bypass path, and controlling inflow control means for controlling inflow of rainwater into the bypass path in conjunction with the rainwater receiving member. A rainwater flow switching device, wherein the inflow control means is configured to reduce or shut off the inflow of rainwater into the bypass path by increasing the amount of water in the rainwater receiving member. 2. The rainwater receiving member according to claim 1, wherein the inflow control means includes a flow port provided in the bypass path, and an opening / closing member capable of approaching and separating from the flow port. Are connected to the bypass path via an elastic member, and the opening / closing member is substantially connected to the communication port by the weight of water in the rainwater receiving member against the elastic force of the elastic member. A flow passage switching device for rainwater, wherein the flow passage switching device is configured to reduce a typical flow cross-sectional area or close the flow opening. 3. The rainwater flow path switching device according to claim 2, wherein the rainwater receiving member is suspended and supported by the opening / closing member in the bypass path. 4. The rainwater receiving member according to claim 3, wherein a drainage port for discharging rainwater is provided at a lower end of the rainwater receiving member, and the drainage port is capable of draining the rainwater with respect to the drainage port. A rainwater flow path switching device, comprising an insertion member inserted in the movable direction of the above and fixed to the bypass path, and the lower end of the rainwater receiving member is supported by the insertion member. 5. The rainwater receiving member according to claim 1, wherein the rainwater receiving member includes a drainage port for discharging rainwater, and the drainage port is drainable in the bypass path with respect to the drainage port. A rainwater flow path switching device, wherein an insertion member inserted in the movable direction of the rainwater and fixed to the bypass path is provided. 6. The water collecting part according to claim 1, wherein the water collecting part is constituted by a water collecting pipe extending from the inflow part and opening to the rainwater tank at a position higher than an opening of the bypass passage. Rainwater flow switching device.