초록 ▼

A filtration device, which can be installed at a relatively low place below the full water level of a storage tank, is obtained. The filtration device is provided with a housing 22 attached to a lower part of an upper vertical pipe 21a and an upper part of a lower vertical pipe 21b from above and be

A filtration device, which can be installed at a relatively low place below the full water level of a storage tank, is obtained. The filtration device is provided with a housing 22 attached to a lower part of an upper vertical pipe 21a and an upper part of a lower vertical pipe 21b from above and below and having a rainwater flow chamber 23 and a valve chamber 24; a ball valve 29 with a specific gravity less than 1 and accommodated in the housing movably between the rainwater flow chamber and the valve chamber for blocking a lower rainwater hole 23b in the rainwater flow chamber; a storage chamber 27 for storing the rainwater having reached the valve chamber from the rainwater flow chamber; a valve-seat opening portion 24b capable of being blocked with the ball valve so as to seal the valve chamber; an upper guiding member 31 for guiding the rising ball valve from the rainwater flow chamber to the valve chamber; and a lower guiding member 32 for guiding the lowering ball valve from the valve chamber to the rainwater flow chamber. A first strainer 26 configured capable of being taken in/out through the valve-seat opening portion is detachably attached to the lower rainwater hole, and a second strainer 33 for filtrating the rainwater flowing into the storage chamber is detachably attached to the storage chamber.

대표청구항 ▼

What is claimed is: 1. A flowing-down rainwater filtration device (20) interposed between an upper vertical pipe (21a) and a lower vertical pipe (21b) coaxial with the upper vertical pipe (21a) for filtrating rainwater flowing down through the upper vertical pipe (21a) and guiding the rainwater to

What is claimed is: 1. A flowing-down rainwater filtration device (20) interposed between an upper vertical pipe (21a) and a lower vertical pipe (21b) coaxial with the upper vertical pipe (21a) for filtrating rainwater flowing down through the upper vertical pipe (21a) and guiding the rainwater to the lower vertical pipe (21b), comprising: a housing (22) attached to a lower part of the upper vertical pipe (21a) and an upper part of the lower vertical pipe (21b) from above and below and having a rainwater flow chamber (23) interposed between the upper vertical pipe (21a) and the lower vertical pipe (21b) and a valve chamber (24) adjacent to the rainwater flow chamber (23); an upper rainwater hole (23a) formed at an upper part of the rainwater flow chamber (23) for having the rainwater flow chamber (23) communicate with the upper vertical pipe (21a) so as to have the rainwater flowing down through the upper vertical pipe (21a) flow into the rainwater flow chamber (23) ; a lower rainwater hole (23b) formed at a lower part of the rainwater flow chamber (23) for having the rainwater flow chamber (23) communicate with the lower vertical pipe (21b) so as to have the rainwater flowing into the rainwater flow chamber (23) flow down to the lower vertical pipe (21b); a ball valve (29) with a specific gravity less than 1 and accommodated in the housing (22) movably between the rainwater flow chamber (23) and the valve chamber (24) for blocking the lower rainwater hole (23b) when the rainwater in the rainwater flow chamber (23) is less than a predetermined amount and the ball valve is disposed in the rainwater flow chamber (23); a storage chamber (27) communicating with the valve chamber (24) and provided at a lower part of the housing (22), for storing the rainwater having reached the valve chamber (24) from the rainwater flow chamber (23); a valve-seat opening portion (24b) formed at an upper part of the housing (22) opposed to the storage chamber (27) so as to open the valve chamber (24) and being capable of sealing the valve chamber (24) by being blocked with the ball valve (29) when the rainwater in the rainwater flow chamber (23) is not less than the predetermined amount and the ball valve (29) is disposed in the valve chamber (24); an upper guiding member (31) provided at the rainwater flow chamber (23) and for guiding the ball valve (29) rising in the rainwater flow chamber (23) from the rainwater flow chamber (23) to the valve chamber (24); and a lower guiding member (32) provided at the valve chamber (24) and for guiding the ball valve (29) lowering in the valve chamber (24) from the valve chamber (24) to the rainwater flow chamber (23). 2. The flowing-down rainwater filtration device according to claim 1, wherein a first strainer (26) for filtrating rainwater of the rainwater flow chamber (23) and having it flow down into the lower vertical pipe (21b), is detachably attached to the lower rainwater hole (23b)and is configured so as to be removable through the valve-seat opening portion (24b); the storage chamber (27) is configured capable of accommodating the ball valve (29); the lower guiding member (32) is foldably configured so as to guide the ball valve (29) lowering in the valve chamber (24) from the valve chamber (24) to the rainwater flow chamber (23) in the extended state and to allow the ball valve (29) to move between the valve chamber (24) and the storage chamber (27) in the folded state. 3. The flowing-down rainwater filtration device according to claim 2, wherein a second strainer (33) for filtrating rainwater flowing into the storage chamber (27) through the valve chamber (24) from the rainwater flow chamber (23), is detachably attached to the storage chamber (27) and is configured capable of being taken in/out through the valve-seat opening portion (24b); and a small-diameter hole (27b) for discharging the rainwater flowing into the storage chamber (27) to the outside is provided at a lower part of the storage chamber (27). 4. The flowing-down rainwater filtration device according to claim 2 or 3, wherein a ring-shaped projection (25) is formed so as to project upward on the inner peripheral edge of the lower rainwater hole (23b), and the peripheral edge of the first strainer (26) is disposed at the upper edge of the projection (25) so that the first strainer (26) is detachably attached to the lower rainwater hole (23b). 5. A rainwater storage device comprising: the filtration device (20) according to claim 4; a rainwater storage tank (11) having the rainwater intake (11a) disposed above the filtration device (20); and a rainwater guide pipe (16) with one end connected to the lower end of the lower vertical pipe (21b) and the other end connected to the rainwater intake (11a), wherein the upper end of the upper vertical pipe (21a) is disposed above the rainwater intake (11a). 6. The rainwater storage device according to claim 5, wherein a check valve (41) for preventing a rainwater flow from the rainwater guide pipe (16) to the lower vertical pipe (21b) is provided at the lower end of the lower vertical pipe (21b) or the rainwater guide pipe (16). 7. The rainwater storage device according to claim 5, wherein a drain valve (17) capable of discharging rainwater in each inside of the upper vertical pipe (21a), the lower vertical pipe (21b) and the rainwater guide pipe (16) to the outside is provided at the lower vertical pipe (21b) or the rainwater guide pipe (16). 8. The rainwater storage device according to claim 7, wherein a check valve (41) for preventing a rainwater flow from the rainwater guide pipe (16) to the lower vertical pipe (21b) is provided at the lower end of the lower vertical pipe (21b) or the rainwater guide pipe (16). 9. A rainwater storage device comprising: the filtration device (20) according to claim 3; a rainwater storage tank (11) having the rainwater intake (11a) disposed above the filtration device (20); and a rainwater guide pipe (16) with one end connected to the lower end of the lower vertical pipe (21b) and the other end connected to the rainwater intake (11a), wherein the upper end of the upper vertical pipe (21a) is disposed above the rainwater intake (11a). 10. The rainwater storage device according to claim 9, wherein a check valve (41) for preventing a rainwater flow from the rainwater guide pipe (16) to the lower vertical pipe (21b) is provided at the lower end of the lower vertical pipe (21b) or the rainwater guide pipe (16). 11. The rainwater storage device according to claim 9, wherein a drain valve (17) capable of discharging rainwater in each inside of the upper vertical pipe (21a), the lower vertical pipe (21b) and the rainwater guide pipe (16) to the outside is provided at the lower vertical pipe (21b) or the rainwater guide pipe (16). 12. The rainwater storage device according to claim 11, wherein a check valve (41) for preventing a rainwater flow from the rainwater guide pipe (16) to the lower vertical pipe (21b) is provided at the lower end of the lower vertical pipe (21b) or the rainwater guide pipe (16). 13. A rainwater storage device comprising: the filtration device (20) according to claim 2; a rainwater storage tank (11) having the rainwater intake (11a) disposed above the filtration device (20); and a rainwater guide pipe (16) with one end connected to the lower end of the lower vertical pipe (21b) and the other end connected to the rainwater intake (11a), wherein the upper end of the upper vertical pipe (21a) is disposed above the rainwater intake (11a). 14. The rainwater storage device according to claim 13, wherein a check valve (41) for preventing a rainwater flow from the rainwater guide pipe (16) to the lower vertical pipe (21b) is provided at the lower end of the lower vertical pipe (21b) or the rainwater guide pipe (16). 15. The rainwater storage device according to claim 13, wherein a drain valve (17) capable of discharging rainwater in each inside of the upper vertical pipe (21a), the lower vertical pipe (21b) and the rainwater guide pipe (16) to the outside is provided at the lower vertical pipe (21b) or the rainwater guide pipe (16). 16. The rainwater storage device according to claim 15, wherein a check valve (41) for preventing a rainwater flow from the rainwater guide pipe (16) to the lower vertical pipe (21b) is provided at the lower end of the lower vertical pipe (21b) or the rainwater guide pipe (16). 17. A rainwater storage device comprising: the filtration device (20) according to claim 1; a rainwater storage tank (11) having the rainwater intake (11a) disposed above the filtration device (20); and a rainwater guide pipe (16) with one end connected to the lower end of the lower vertical pipe (21b) and the other end connected to the rainwater intake (11a), wherein the upper end of the upper vertical pipe (21a) is disposed above the rainwater intake (11a). 18. The rainwater storage device according to claim 17, wherein a drain valve (17) capable of discharging rainwater in each inside of the upper vertical pipe (21a), the lower vertical pipe (21b) and the rainwater guide pipe (16) to the outside is provided at the lower vertical pipe (21b) or the rainwater guide pipe (16). 19. The rainwater storage device according to claim 17 or 18, wherein a check valve (41) for preventing a rainwater flow from the rainwater guide pipe (16) to the lower vertical pipe (21b) is provided at the lower end of the lower vertical pipe (21b) or the rainwater guide pipe (16).