JP4890341B2 - Flowing rainwater filtration device - Google Patents

Description

  The present invention relates to a falling rainwater filtering device that removes initial rainwater that contains a relatively large amount of foreign matter from rainwater that falls and flows down on the roof or roof of a building.

  Conventionally, it is known that rainwater that falls and flows down on the roof or roof of a building often contains sand and fine dust in the rainwater at the beginning of the rain. For this reason, the initial rainwater is removed and stored, and the subsequent rainwater that does not contain sand or fine dust is effectively used. And the falling rainwater filtration apparatus which removes the initial rainwater which contains sand and dust comparatively much is proposed (for example, refer to patent documents 1). This filtering device has a housing interposed between an upper vertical pipe and a lower vertical pipe that allows rainwater that has flowed down to the roof or roof of the building, and the rainwater flows through the housing between the upper vertical pipe and the lower vertical pipe. Forming a chamber, forming a valve chamber in the housing adjacent to the rainwater circulation chamber and allowing the initial rainwater to flow down the upper vertical pipe in the initial stage, and storing a storage chamber for storing the initial rainwater flowing into the valve chamber in the housing. It is provided at the bottom.

In such a falling rainwater filtration device, the initial rainwater is stored in the storage room, and only the subsequent rainwater that does not contain sand or fine dust flows down from the upper vertical pipe to the lower vertical pipe for effective use. Be able to. In this conventional filtration device, a small-diameter hole is formed in the lower part of the storage chamber, and initial rainwater stored in the storage chamber is discharged to the outside through the small-diameter hole. Thus, by providing the small-diameter hole in the lower part of the storage chamber, the initial rainwater that flows into the storage chamber and is stored is gradually discharged from the small-diameter hole to the outside until the rain stops. The situation where it is stored is avoided, and the initial rainwater that falls after that is reliably stored in this storage room.
JP 2006-144504 A (Claims, FIG. 1)

However, in the conventional filtration device described above, a small-diameter hole is formed in the lower portion of the storage chamber for storing the initial rainwater containing a relatively large amount of sand and fine dust, so that the initial rainwater stored in the storage chamber is made outside. There was a problem that the small-diameter hole to be discharged was blocked by sand or fine dust. For this reason, while providing a mesh-like filter so as to cover the upper portion of the small-diameter hole so that the small-diameter hole is not blocked, the small-diameter hole is regularly cleaned. Since the small-diameter hole was directly formed in the bottom plate constituting the lower part of the plate, there was a problem that the cleaning itself was relatively complicated.
SUMMARY OF THE INVENTION An object of the present invention is to provide a falling rainwater filtering device that can relatively easily wash a small-diameter hole that discharges initial rainwater stored in a storage chamber to the outside.

As shown in FIG. 1, the invention according to claim 1 includes a housing 12 interposed between an upper vertical pipe 11a, an upper vertical pipe 11a, and a lower vertical pipe 11b coaxial with the upper vertical pipe 11a. A rainwater circulation chamber 13 that is formed in the housing 12 between the lower vertical pipes 11b and flows through the upper vertical pipe 11a to the lower vertical pipe 11b, and an upper side that is formed in the housing 12 adjacent to the rainwater circulation chamber 13. A valve chamber 14 for injecting initial rainwater flowing down the vertical pipe 11a in the initial stage, and a storage chamber for communicating the valve chamber 14 at the lower portion of the housing 12 and storing the initial rainwater flowing into the valve chamber 14 from the rainwater circulation chamber 13 17 and a falling rainwater filtering device provided with a small-diameter hole 32a that is provided at a lower portion of the storage chamber 17 and discharges initial rainwater stored in the storage chamber 17 to the outside.
The characteristic structure is that a cylindrical body 31 that communicates the storage chamber 17 with the outside is provided in the lower part of the storage chamber 17 with its axial center vertical, and a rod-shaped member 32 is detachably mounted on the cylindrical body 31 from below. The rod-shaped member 32 has a small-diameter hole 32 a communicating with the cylinder 31.

In the falling rainwater filtering device according to claim 1, the initial rainwater when it starts to rain contains a relatively large amount of dust, but the initial rainwater that contains a relatively large amount of dust is distributed as rainwater. It flows down from the chamber 13 to the storage chamber 17 through the valve chamber 14 and is stored in the storage chamber 17. The small-diameter hole 32a formed in the lower portion of the storage chamber 17 gradually discharges the initial rainwater stored in the storage chamber 17, and avoids a situation in which rainwater is stored in the storage chamber 17 until after the rain has stopped.
On the other hand, when cleaning the small-diameter hole 32a, the rod-shaped member 32 is removed from the cylindrical body 31. In this case, since the rod-shaped member 32 is attached to the cylindrical body 31 from below, the rod-shaped member 32 can be removed from the outside of the storage chamber 17. And the clogging of the small diameter hole 32a formed in the rod-shaped member 32 can be eliminated by washing the removed rod-shaped member 32. Therefore, it is possible to relatively easily clean the small-diameter hole.

The invention according to claim 2 is the invention according to claim 1, and as shown in FIG. 2, the cylindrical body 31 is a cylinder, and a vertical slit 31 a whose lower end opens at the lower end edge is formed in the axial direction, A horizontal slit 31b whose one end is connected to the upper end of the vertical slit 31a is formed in the circumferential direction, the outer shape of the rod-shaped member 32 is formed in a circular shape that can be inserted into the cylindrical body 31, and a protrusion 32b that can enter the vertical slit 31a has a rod shape. A protrusion 32b formed on the outer periphery of the member 32 and having the vertical slit 31a moved upward from the lower end is advanced into the horizontal slit 31b, and the rod-shaped member 32 is detachably mounted on the cylinder 31.
In the falling rainwater filtering device described in claim 2, as shown by a broken line arrow in FIG. 2, the rod-shaped member 32 is rotated about its central axis, and the protrusions 32 b formed around it are laterally moved. The rod-like member 32 can be removed from the cylindrical body 31 by moving along the slit 31b and being positioned at the upper end of the vertical slit 31a and withdrawing in the axial direction in this state. For this reason, the removal operation can be further facilitated.

The invention according to claim 3 is the invention according to claim 1 or 2, characterized in that a filter 33 covering the cylinder 31 from above is detachably attached to the storage chamber 17.
In the falling rainwater filtering device according to the third aspect, the foreign matter mixed in the initial rainwater flowing into the storage chamber 17 is captured by the filter 33, so that the small-diameter hole 32a is blocked by sand or fine dust. The frequency can be reduced.
On the other hand, since the filter 33 is detachably attached to the storage chamber 17, when a relatively large amount of foreign matter accumulates on the filter 33, the filter 33 can be removed from the storage chamber 17 and cleaned.

  In the falling rainwater filtration device of the present invention, a cylindrical body that communicates the storage chamber with the outside is provided in the lower portion of the storage chamber, the axial center of which is vertically provided, and a rod-shaped member is detachably attached to the cylindrical body from below. Since the small-diameter hole communicating with the cylinder is formed in the member, the cleaning of the small-diameter hole can be performed by removing the rod-shaped member from the cylinder. In this case, since the rod-shaped member is attached to the cylindrical body from below, the rod-shaped member can be removed from the outside of the storage chamber, and the small-diameter hole formed in the rod-shaped member by washing the removed rod-shaped member. Clogging can be eliminated. Therefore, it is possible to relatively easily clean the small-diameter hole.

  Also, the cylinder is a cylinder, and a vertical slit whose lower end opens at the lower end edge is formed in the axial direction, and a horizontal slit whose one end is connected to the upper end of the vertical slit is formed in the circumferential direction. It is formed in a circular shape that can be inserted into the body, a protrusion that can enter the vertical slit is formed on the outer periphery of the rod-shaped member, and the protrusion that has moved the vertical slit upward from the lower end enters the horizontal slit to attach the rod-shaped member to the cylinder Then, the rod-shaped member is rotated about its central axis, the projection is moved along the horizontal slit to be positioned at the upper end of the vertical slit, and in this state, the rod-shaped member is removed from the cylindrical body by being pulled out in the axial direction. Can be removed. If the filter that covers the cylinder from above is detachably attached to the storage chamber, foreign matter mixed in the initial rainwater flowing into the storage chamber is captured by the filter, so that the small-diameter hole is blocked by sand or fine dust. Can reduce the frequency.

Next, the best mode for carrying out the present invention will be described with reference to the drawings.
As shown in FIG. 1, a falling rainwater filtering device 10 according to the present invention includes a housing 12 in which a lower part of an upper vertical pipe 11a and an upper part of a lower vertical pipe 11b are attached from above and below. Although not shown in the drawing, the upper vertical pipe 11a is a cylindrical object whose upper end is connected to a rain gutter provided at the edge of the roof of the house, and the rain that has fallen on the roof of the house flows into the gutter and is collected and collected. The generated rainwater is configured to flow down from the rain gutter to the upper vertical pipe 11a. When viewed from above, the housing 12 has an oval shape whose major axis is approximately twice the outer diameter of the vertical tubes 11a and 11b and whose minor axis is slightly larger than the outer diameter of the vertical tubes 11a and 11b. The upper lid 12a and the lower lid 12b are formed by fitting around the upper lid 12a and the lower lid 12b.

  An upper short pipe 12c into which the lower part of the upper vertical pipe 11a is inserted is provided at the upper part of one end of the housing 12, and the lower vertical pipe is provided at the lower part of one end of the housing 12 facing the upper short pipe 12c. A lower short pipe 12d into which the upper part of 11b is fitted is provided. By inserting the lower part of the upper vertical pipe 11a into the upper short pipe 12c and fitting the upper part of the lower vertical pipe 11b into the lower short pipe 12d, they are attached to the housing 12 from above and below. A rainwater circulation chamber 13 interposed between the upper vertical pipe 11 a and the lower vertical pipe 11 b and a valve chamber 14 adjacent to the rainwater circulation chamber 13 are formed inside the housing 12.

  In the upper part of the rainwater circulation chamber 13, an upper rainwater hole 13 a is formed in which the rainwater circulation chamber 13 communicates with the upper vertical pipe 11 a and rainwater flowing down the upper vertical pipe 11 a flows into the rainwater circulation chamber 13. On the other hand, a lower rainwater hole 13b is formed in the lower part of the rainwater circulation chamber 13 so that the rainwater circulation chamber 13 communicates with the lower vertical pipe 11b and the rainwater flowing into the rainwater circulation chamber 13 flows down to the lower vertical pipe 11b. Is done. A ring-shaped protrusion 15 is formed on the inner peripheral edge of the lower rainwater hole 13b so as to protrude upward. The peripheral edge of the first strainer 16 is installed on the upper edge of the protrusion 15, and the first strainer 16 is connected to the lower rainwater hole. Removably attached to 13b. The first strainer 16 in this embodiment is formed by forming a wire mesh into a bottomed cylindrical shape, and is formed so that the outer diameter of the bottomed cylindrical strainer 16 is slightly smaller than the inner diameter of the ring-shaped protrusion 15. A flange 16 a that can be installed at the upper end of the protrusion 15 is formed at the periphery of the opening of the strainer 16. The strainer 16 is detachably attached to the lower rainwater hole 13b by installing the flange 16a on the protrusion 15 and inserting the bottomed tube portion into the lower rainwater hole 13b.

  On the other hand, another short tube 12e is provided at the lower part of the other end of the housing 12 adjacent to the lower short tube 12d. In addition, a bottomed cylindrical storage case 17 a that internally forms a storage chamber 17 is fitted to the short tube 12 e from below, and the storage case 17 a is provided in the lower part of the housing 12. In the lower part of the valve chamber 14, the valve chamber 14 is communicated with the storage chamber 17, and rainwater reaching the valve chamber 14 from the rainwater circulation chamber 13 further flows down into the storage chamber 17 and is stored in the storage chamber 17. Is formed.

  The housing 12 houses a ball valve 18 that can move between the rainwater circulation chamber 13 and the valve chamber 14. The ball valve 18 is a valve composed of a ball having a specific gravity of less than 1, and a valve seat opening 14 b that can be sealed by the ball valve 18 to seal the valve chamber 14 is provided on the housing 12. The valve chamber 14 is formed at the top so as to open. A packing 19 is fitted to the edge of the valve seat opening 14b, and the ball valve 18 floats in the valve chamber 14 and abuts against the packing 19 when rainwater in the rainwater circulation chamber 13 exceeds a predetermined amount. Thus, the ball valve 18 is configured to close the valve chamber 14 by closing the valve seat opening 14b. And the opening part 14b for valve seats is formed in the magnitude | size which can insert the 1st strainer 16, and the cover body 12f is installed in the upper surface of the housing 12 so that this valve seat opening part 14b may be covered, The lid is formed with a knob portion 12g that is held by an operator.

  Further, the rainwater circulation chamber 13 is provided with an upper guide member 21 for guiding the ball valve 18 rising in the rainwater circulation chamber 13 from the rainwater circulation chamber 13 to the valve chamber 14. A lower guide member 22 for guiding the ball valve 18 descending at 14 from the valve chamber 14 to the rainwater circulation chamber 13 is provided. The upper guide member 21 is a plate material that is inclined so as to cross the rainwater inflow chamber 13 at the upper part of the rainwater inflow chamber 13 and be upward toward the valve chamber 14. On the other hand, the lower guide member 22 is a plate member that is inclined at the lower part of the valve chamber 14 so as to cross the valve chamber 14 and to be lowered toward the rainwater inflow chamber 13, and is configured to be foldable. The lower guide plate 22 guides the ball valve 18 descending in the valve chamber 14 in the extended state from the valve chamber 14 to the rainwater circulation chamber 13, and the ball valve 18 moves between the valve chamber 14 and the storage chamber 17 in the folded state. Configured to allow.

  The storage chamber 17 is configured to be capable of storing a ball valve 18, and a bottomed cylindrical second strainer 23 that filters rainwater flowing into the storage chamber 17 from the valve chamber 14 is detachably attached to the storage chamber 17. The second strainer 23 is formed so as to be able to be inserted through the valve seat opening 14b. In this embodiment, a horizontal flat plate 24 that partitions the storage chamber 17 up and down is provided, and a second strainer 23 is detachably attached to a central hole 24 a formed in the flat plate 24. The second strainer 23 is formed by forming a wire mesh into a bottomed cylindrical shape, and its outer diameter is formed to be slightly smaller than the inner diameter of the central hole 24a. A flange 23a that can be installed at the hole edge of the hole 24a is formed. The second strainer 23 is detachably attached to the storage chamber 17 by inserting the bottomed tube portion into the central hole 24a and installing the flange 23a at the hole edge of the central hole 24a.

A drain valve 28 for discharging rainwater flowing into the storage chamber 17 is provided at the bottom of the storage chamber 17. The drain valve 28 is configured to be able to open and close a large-diameter hole 28d having a cross-sectional diameter of 8 to 15 mm by operating the handle 28a. By opening the large-diameter hole 28d, rainwater stored in the storage chamber 17 is made large. It is configured to be discharged to the outside relatively quickly through the diameter hole 28d.
In addition, a small-diameter hole 32a is provided at the bottom of the storage chamber 17 together with the drain valve 28 to allow the rainwater flowing into the storage chamber 17 to be discharged slightly. That is, a cylindrical body 31 that communicates with the storage chamber 17 to the outside is provided below the storage chamber 17 with its axis being vertical. A rod-shaped member 32 is detachably attached to the cylindrical body 31 from below, and a small-diameter hole 32 a communicating with the cylindrical body 31 is formed in the rod-shaped member 32.

  As shown in detail in FIG. 2, a short tube 17 b having a circular cross section is formed at the bottom of the case 17 a constituting the storage chamber 17. The cylindrical body 31 has a large-diameter portion 31c having a circular cross section, and a small-diameter portion 31d that is coaxial with the large-diameter portion 31c and is continuously formed on the large-diameter portion 31c. The large diameter portion 31c is formed to have the same outer diameter as that of the short tube 17b, and the small diameter portion 31d is formed to have an outer diameter slightly smaller than the inner diameter of the short tube 17b. Then, the small-diameter portion 31d is inserted into the short tube 17b from below, the upper edge of the large-diameter portion 31c is brought into contact with the lower edge of the short tube 17b, and in this state, the cylinder 31 is attached to the short tube 17b using an adhesive. Glue. As a result, a cylindrical body 31 that allows the storage chamber 17 to communicate with the outside is provided below the storage chamber 17 with its axis being vertical. In the large-diameter portion 31c that is a cylinder, a vertical slit 31a having a lower end opening at the lower end edge is formed in the axial direction, and a horizontal slit 31b having one end connected to the upper end of the vertical slit 31a is formed in the circumferential direction. Is done.

  On the other hand, the rod-shaped member 32 has an insertion cylinder part 32c having an outer diameter that can be inserted into the large diameter part 31c of the cylinder 31, and a gripping part 32d coaxial with the insertion cylinder part 32c. It is formed continuously in 32c. A protrusion 32b that can enter the vertical slit 31a is formed on the outer periphery of the insertion cylinder portion 32c of the rod-shaped member 32. Then, the protrusion 32b moved upward from the lower end of the vertical slit 31a is caused to enter the horizontal slit 31b, so that the rod-like member 3232 is detachably attached to the cylindrical body 31. Further, as shown in FIG. 3, the gripping portion 32d has a circular outer diameter and is formed into an outer shape obtained by cutting out both sides of the circular shape. The gripping portion 32d is rotated by sandwiching the gripping portion 32d from both sides. The operation of rotating the member 32 is surrounded. And the small diameter hole 32a is formed in the connection part of the insertion cylinder part 32c and the holding part 32d.

  The small-diameter hole 32a is formed in the axial direction along the central axis of the rod-shaped member 32, and the small-diameter hole 32a has a circular cross section and has a diameter of 0.8 to 2.0 mm. The small-diameter hole 32a gradually drains the initial rainwater that has flowed into and stored in the storage chamber 17 to the outside. After the rain stops, the storage chamber 17 is emptied, and the rainwater enters the storage chamber 17 until the rain stops. It is for avoiding the situation where water is stored. For this reason, the filter device 10 is configured so that the presence of the small-diameter hole 32a can reliably store the initial rainwater in the storage chamber 17 when it rains again after the rain has once stopped.

  A filter 33 that covers the cylinder 31 from above is detachably attached to the storage chamber 17 in the storage chamber 17. That is, since the small diameter hole 32a is relatively easily clogged, the cylinder 31 to which the rod-like member 32 having the small diameter hole 32a is attached is covered with the filter 33 in order to prevent the clogging. The filter 33 in this embodiment includes a perforated tube 34 that is provided coaxially with the cylinder 31 and has a plurality of holes 34a formed around it, and a net 36 that covers the upper part of the perforated tube 34 together with all the holes 34a. Become. A positioning projection 17d is formed on the bottom of the case 17a constituting the storage chamber 17 so as to surround the periphery of the lower portion of the perforated tube 34 and determine its installation location. The filter 33 is detachably attached to the storage chamber 17 by installing the lower end of the perforated tube 34 in a portion surrounded by the positioning projection 17d.

Next, the operation of the falling rainwater filtration apparatus configured as described above will be described.
When rain falls on the roof of a house (not shown), the rain flows along the slope of the roof and flows into the gutter and is collected. The collected rainwater flows down from the rain gutter through the upper vertical pipe 11a and reaches the filtration device 10. In the filtration device 10 that has begun to rain, the ball valve 18 is in the rainwater circulation chamber 13 and closes the lower rainwater hole 13b. Accordingly, the rainwater flows into the rainwater inflow chamber 13 from the upper vertical pipe 11a, and the initial rainwater when the rain starts to be received is received by the peripheral surface of the ring-shaped protrusion 15 and is guided to the valve chamber 14 and further into the storage chamber 17. To flow down. Thus, although the initial rainwater when it starts to rain contains a relatively large amount of dust, the initial rainwater containing a relatively large amount of dust is transferred from the rainwater circulation chamber 13 to the lower side through the lower rainwater hole 13b. It is possible to reliably prevent the flow down to the vertical pipe 11b. Here, a relatively large amount of dust contained in the initial rainwater is supplemented by the second strainer 23 provided in the storage chamber 17, and the filtered rainwater reaches the bottom of the storage chamber 17 and is stored in the storage chamber 17. The

  If the amount of rainwater that continues to rain and flows down inside the rainwater inflow pipe 12 increases beyond the amount discharged to the outside from the small-diameter hole 32a formed in the storage chamber 17, the rainwater inflow chamber 13 exceeds the storage chamber 17 When the rainwater begins to accumulate in the valve chamber 14 and the water level exceeds the upper end of the ring-shaped protrusion 15, the ball valve 18 having a specific gravity of less than 1 floats, and then clean rainwater with relatively little dust flowing down from the upper vertical pipe 11a is obtained. It flows into the lower vertical pipe 11b from the rainwater circulation chamber 13 through the lower rainwater hole 13b. Here, since the first strainer 16 is attached to the lower rainwater hole 13b so as to close the lower rainwater hole 13b, from the rainwater flowing into the lower vertical pipe 11b via the lower rainwater hole 13b, Foreign matter mixed in is removed by the strainer 16.

  On the other hand, the small-diameter hole 32a formed in the lower part of the storage chamber 17 gradually discharges the initial rainwater stored in the storage chamber 17, and avoids a situation in which rainwater is stored in the storage chamber 17 until the rain stops. To do. When the small diameter hole 32a is blocked by sand or fine dust, the small diameter hole 32a is cleaned. When cleaning the small-diameter hole 32a, the rod-shaped member 32 is removed from the cylindrical body 31. In this case, since the rod-shaped member 32 is attached to the cylindrical body 31 from below, the rod-shaped member 32 can be removed from the outside of the storage chamber 17. And the clogging of the small diameter hole 32a formed in the rod-shaped member 32 can be eliminated by washing the removed rod-shaped member 32. Therefore, it is possible to relatively easily clean the small-diameter hole.

  Here, the vertical slit 31a and the horizontal slit 31b are formed in the cylindrical body 31, the protrusion 32b that can enter the vertical slit 31a is formed on the outer periphery of the rod-shaped member 32, and the protrusion 32b that has moved the vertical slit 31a upward from the lower end is formed. Since the rod-shaped member 32 is removably attached to the cylindrical body 31 by entering the horizontal slit 31b, the rod-shaped member 32 is rotated around its central axis as shown by a broken line arrow in FIG. The formed protrusion 32b is moved along the horizontal slit 31b to be positioned at the upper end of the vertical slit 31a, and the rod-shaped member 32 can be removed from the cylindrical body 31 by being pulled out in the axial direction in this state. For this reason, the removal operation is easy, and the cleaning operation can be further facilitated. If the small diameter hole 32a is cleaned immediately after raining and rainwater remains in the storage chamber 17, the handle 28a of the drain valve 28 is rotated to open the large diameter hole 28d. If so, the rainwater inside the storage chamber 17 is quickly discharged to the outside, so that it can be performed after the rainwater is not discharged.

  The filter 33 that covers the cylinder 31 from above captures foreign matters mixed in the initial rainwater that has flowed into the storage chamber 17, and reduces the frequency with which the small-diameter hole 32 a is blocked by sand or fine dust. Since the filter 33 is detachably attached to the storage chamber 17, when a relatively large amount of foreign matter accumulates on the filter 33, the filter 33 is taken out from the storage chamber 17 and cleaned. In addition, foreign matter accumulates on the first and second strainers 16 and 23 of the filtration device 10. For this reason, even in these strainers 16 and 23, it is necessary to take out and wash | clean it for every predetermined period. When the filter 33 and strainers 16 and 23 are taken out, the lid 12f is removed and the valve seat opening 14b appears. Then, since the ball valve 18 is in the rainwater circulation chamber 13 and closes the lower water passage hole 13b, the valve seat opening 14b is opened. For this reason, the lower guide member 22 can be folded through the valve seat opening 14b, and the filter 33 and the second strainer 23 can be taken out from the storage chamber 17 through the valve seat opening 14b. When the ball valve 18 that closes the lower water passage hole 13b by dropping the lower guide member 22 is dropped into the storage chamber 17, the first strainer 16 is connected to the rainwater circulation chamber 13 via the valve seat opening 14b. Can be taken from. For this reason, the first and second strainers 16, 23 can be easily taken out from the housing 12, and the inspection and cleaning thereof can be performed relatively easily.

It is a longitudinal cross-sectional view which shows the structure of the filtration apparatus of embodiment of this invention. It is an enlarged view of the A section of FIG. It is a bottom view of the rod-shaped member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Filtration apparatus 11a Upper vertical pipe 11b Lower vertical pipe 12 Housing 13 Rain water distribution chamber 14 Valve chamber 17 Storage chamber 31 Cylindrical body 31a Vertical slit 31b Horizontal slit 32 Bar-shaped member 32a Small diameter hole 32b Protrusion 33 Filter

Claims (3)

It has a housing (12) interposed between the upper vertical pipe (11a) and the lower vertical pipe (11b) coaxial with the upper vertical pipe (11a), the upper vertical pipe (11a) and the lower side A rainwater circulation chamber (13) formed in the housing (12) between the vertical pipes (11b) and flowing rainwater flowing down the upper vertical pipe (11a) to the lower vertical pipe (11b), and the rainwater circulation chamber A valve chamber (14) formed in the housing (12) adjacent to (13) and into which initial rainwater flows down the upper vertical pipe (11a) in an initial stage, and communicates with the valve chamber (14). A storage chamber (17) provided at a lower portion of the housing (12) for storing initial rainwater flowing from the rainwater circulation chamber (13) into the valve chamber (14), and provided at a lower portion of the storage chamber (17). In the falling rainwater filtration device provided with a small diameter hole (32a) for discharging the initial rainwater stored in the storage chamber (17) to the outside,
A cylindrical body (31) that communicates the storage chamber (17) with the outside is provided at a lower portion of the storage chamber (17) with its axis being vertical,
A rod-shaped member (32) is detachably attached to the cylindrical body (31) from below,
A falling rainwater filtering device, wherein the rod-shaped member (32) has a small-diameter hole (32a) communicating with the cylinder (31). The cylindrical body (31) is a cylinder, and a vertical slit (31a) having a lower end opening at the lower end edge is formed in the axial direction, and a lateral slit (31b) having one end connected to the upper end of the vertical slit (31a) is a circumference. Formed in the direction,
The outer shape of the rod-shaped member (32) is formed in a circular shape that can be inserted into the cylindrical body (31), and a protrusion (32b) that can enter the vertical slit (31a) is formed on the outer periphery of the rod-shaped member (32).
The rod-like member (32) is detachably mounted on the cylindrical body (31) by causing the protrusion (32b) moved upward from the lower end of the vertical slit (31a) to enter the horizontal slit (31b). The falling rainwater filtration device according to 1.   The falling rainwater filtering device according to claim 1 or 2, wherein a filter (33) covering the cylinder (31) from above is detachably attached to the storage chamber (17).

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